Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed998d13c4d4504…

MALICIOUS

PDF

76.0 KB Created: 2021-04-25 00:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 399f5bf0c1854ae395c77bd7eac8338f SHA-1: 15013f9afc4c1f9da2dc090885ea752ce15ac96f SHA-256: 1ed998d13c4d4504552d190b0ec2202a9eb9e26c141ee580c8141424c889e69d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/strik?utm_term=program+philips+universal+remote+codes PDF link annotation
    • http://allerop.xyz/states_of_matter_crossword_worksheet_answerstou3n.pdfIn PDF document text
    • http://randname.ru/excel_2013_vs_2016_differenceslii5i.pdfIn PDF document text
    • http://storeplus.pro/string_tuner_432_hertz_tunerqel6a.pdfIn PDF document text
    • http://indir-kazan.com/how_many_quarts_of_transmission_fluid_does_a_nissan_murano_take26dlz.pdfIn PDF document text
    • http://lg-supportteam.com/how_to_date_a_browngirl_quizletzp031.pdfIn PDF document text
    • http://filmera.ru/9562352545250tn.pdfIn PDF document text
    • http://japancar-sib.ru/vexazitabozev4pfsb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_fa65e3a3b1464971a082ad1fe3132a74.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0941c782-d777-4d0f-b0a6-1e23b557aab8/how_does_firestar_lose_all_his_lives.pdfIn PDF document text
    • http://bekujosekufeto.epizy.com/mirifexarivonivenedip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b76e93-33af-4454-804d-4a1673aa513d/effective_communication_in_nursing.pdfIn PDF document text
    • http://texovej.epizy.com/besilato_de_anlodipino_bula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f77f07c-093a-4044-bf67-6bdfb2c3292e/dish_network_vip722k_manual.pdfIn PDF document text
    • http://pewokes.epizy.com/the_lord_of_the_rings_movie_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba434fbb-8bba-4096-8d70-11b77cb74377/48790203003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44685bde-d9f2-4a31-86de-1fb3d7339f29/58017442315.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_271cb18501f0435f8d9179536bb2ecda.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e092b33-3601-436e-970b-1ba1c93f8825/starting_online_business.pdfIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_592884d31ff943d780011cc669127cfc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/343820c5-7517-4f7b-8ad6-8db5b41495a9/gozukexabus.pdfIn PDF document text
    • http://gewevamaki.epizy.com/escape_room_answer_level_141.pdfIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_1c918b4cbae543b7ba20cd1f4f0d8f81.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCD 5548 bytes
SHA-256: 1f08cf1a9ab6dcd40ba4d577492e4cc3d15db1c650cda01234f8dd270d1626d8
font_01_sfnt_off0000ff88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 10312 bytes
SHA-256: fa753a2d45b62177e8ac7f08866b8f3253430623fcbebb973130d9461db883a0