Malicious PDF — malware analysis report

Static analysis result for SHA-256 779862705d8e2cdb…

MALICIOUS

PDF

102.6 KB Created: 2021-05-04 05:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b28ffe97531ec4d8fda96cea269b3c02 SHA-1: 659398c4232bf37ee1530db2a2b645830f746b7f SHA-256: 779862705d8e2cdbe31afc1846620146f645e9291fedfcd898e0920ce932fe12
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of URLs like 'https://maypoin.ru/strik?utm_term=how+to+thread+needle+on+brother+se400' suggest a phishing or scam attempt disguised as search results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/strik?utm_term=how+to+thread+needle+on+brother+se400 PDF link annotation
    • http://puduzex.22web.org/1173893754.pdfIn PDF document text
    • http://supportcopyright.net/what_is_folk_culture_in_human_geography4pbbc.pdfIn PDF document text
    • http://fesabip.iblogger.org/intex_12x30_pool_filter_replacement.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/gumimisijaxufobosaz.pdfIn PDF document text
    • http://koteyarn.moscow/4417558222238xw7.pdfIn PDF document text
    • http://afracheat1.xyz/inflatable_pong_table_walmarto0m2x.pdfIn PDF document text
    • http://muldwych.com/wodovoforokevxxmk9.pdfIn PDF document text
    • https://jadozuvar.weebly.com/uploads/1/3/5/3/135312187/5988693.pdfIn PDF document text
    • http://7lessons.website/how_to_program_a_genie_garage_door_clickeruk5bp.pdfIn PDF document text
    • https://logosomuzabi.weebly.com/uploads/1/3/0/9/130969340/bajedixujudupeso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wefadep/evenflo_car_seat_base_safezone.pdfIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_63f7777cdb5946c5bc05b2e451e50984.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3614d43-a4fe-4410-935b-5fa603f76404/81035782171.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_44a9155d2ee94af5a9f43716f36e9c40.pdf?index=trueIn PDF document text
    • http://pakemeza.epizy.com/rotoxajibijigikadogej.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/48131738742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eb533f7-d43c-4111-bb87-9fa84450f996/21091477676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76f79441-88c8-4547-a6ae-981f287cf46e/the_ministers_black_veil_discussion_questions_answers.pdfIn PDF document text
    • http://velefaluzi.epizy.com/popisawowa.pdfIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_6347f28c0ee64c44bed52814e84a1552.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/waxapoz/sifoxazabufujokezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb965b80-50e9-4364-9126-ec6e32202271/triangle_congruence_practice_worksheet.pdfIn PDF document text
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_ed5063aa2c69417787a7cecdd617ea4f.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF66 6416 bytes
SHA-256: 9e91590ae502ff902ba306624a00c8d44396a7ee9717b1bfa1717db63fe08483
font_01_sfnt_off00010f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F08 3212 bytes
SHA-256: 116a1b1ad6e0b3d7f59f55484aedc15c35d41f11e844f891a61235e9fe587d57
font_02_sfnt_off00011a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A74 5336 bytes
SHA-256: 5850c2f6a4887c428226dd964f4cbf60a8bc6b35383b8b8c2bd77cecbc00174d
font_03_sfnt_off00012c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C96 8364 bytes
SHA-256: 82786e842b0dc16de0c85401e3e69bcb3a3f3a8ef3ea23900694b08ad433217b
font_04_sfnt_off00014796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14796 11136 bytes
SHA-256: 3dc69670b87c023895e1131a9ba60975d6d8470ddbebcb5223a2b83a1060469b
font_05_sfnt_off00016df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DF1 16256 bytes
SHA-256: 0c28d55d9957e5be45f9d3302843a1d8772fc4e8a9a81ea04eed1b5cc2016f23
font_06_sfnt_off0001834e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1834E 1736 bytes
SHA-256: 5095ccdfdd328c3f25b1766e9c65bca58fa839170fcb9f3db3c20e130d955aff

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