Malicious PDF — malware analysis report

Static analysis result for SHA-256 e730754f0a20f7b9…

MALICIOUS

PDF

121.6 KB Created: 2021-04-01 07:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: aca8a1c13079ebf7e6b9d4416d85f4b4 SHA-1: dc9e3104b6f4219eab6d2db79d54b4ab39b90619 SHA-256: e730754f0a20f7b9ada2ee523b730f8e57f8371982f17f1b41aa16e2843e44fe
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to be a lure for free book downloads, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://jottigo.ru/award?keyword=ba+tamil+1st+year+books+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417312/normal_6002c3262fe9f.pdfIn PDF document text
    • https://zinegekoxemajaj.weebly.com/uploads/1/3/4/7/134767253/muwitekajibas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466364/normal_604513879db6c.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/iicBjiT/go_climb_a_rock_t_shirt_star_trek.pdfIn PDF document text
    • http://jegotaraxipux.iblogger.org/backtrack_gps_app_android.pdfIn PDF document text
    • https://tinonerapize.weebly.com/uploads/1/3/5/3/135349756/desigubazawenupul.pdfIn PDF document text
    • https://bigudiwox.weebly.com/uploads/1/3/5/3/135304820/sepagogani-xufagi-remetuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_600b2c0abe434.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebosatu/NKmzhfz/nuweluludek.pdfIn PDF document text
    • https://nifonafepo.weebly.com/uploads/1/3/5/3/135319448/506143.pdfIn PDF document text
    • https://deminoki.weebly.com/uploads/1/3/5/3/135310913/jetumawabe-zaviz-zonoj-muruluf.pdfIn PDF document text
    • https://cdn.sqhk.co/lutotilivik/xigijij/heart_rhythm_app_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472221/normal_6046895781dde.pdfIn PDF document text
    • https://cdn.sqhk.co/jugokake/wBihgEA/ghost_ella_henderson_sheet_music_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tixedujegibex/the_retirement_miracle_book_edition_patrick_kelly.pdfIn PDF document text
    • http://sewuxikamumo.rf.gd/danby_chest_freezer_parts_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/nagif.pdfIn PDF document text
    • http://konevimojo.epizy.com/ias_21_functional_currency.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af49b7d6-6940-440c-9639-6fc749fef0a9/bausch_and_lomb_antique_microscope_value.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb06d13-8b27-4003-9aea-7959fe0de4f9/maximum_strength_warm_up_marching_band.pdfIn PDF document text
    • http://lebekad.rf.gd/cd40106bm_datasheet.pdfIn 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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000138bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BD 5472 bytes
SHA-256: 02066a9cb59fbe3add05ab6fc34635e2bdaf0622c47a572bdecc18b3d9e994a9
font_01_sfnt_off00014b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B4F 14512 bytes
SHA-256: 26edc012f2841614080bb35b53bc20c8d42d982650faa34c50132d5a60e58fd5
font_02_sfnt_off00016ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ED3 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_03_sfnt_off00017a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A34 2596 bytes
SHA-256: 82c047ac093810968bc043e1395e19a776fddf61b5ae473d26a3e46c73460b1c
font_04_sfnt_off000185bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185BF 11804 bytes
SHA-256: 9f3feb6e0967d197efdb56946bba2e72871b209095f13c71861eaafd64080c75
font_05_sfnt_off0001ade7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADE7 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
font_06_sfnt_off0001bbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBE8 8072 bytes
SHA-256: 4509718f88cb78b9d4b4f6fa34810ca15787795d9b00caba31c0638dc22cc750

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