Malicious PDF — malware analysis report

Static analysis result for SHA-256 f797a63fa7c20ff9…

MALICIOUS

PDF

75.2 KB Created: 2021-03-30 09:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6d4e41ba947e2007405ae9ecdb91b619 SHA-1: 841dc378d954ab247451213d28f7cb07a573b0eb SHA-256: f797a63fa7c20ff9dc7acbe584f91360b4a1a1c0a845b542b6ced7418563e283
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous external PDF links, with one primary URL pointing to zajinet.ru. This suggests the document's purpose is to direct users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/strik?utm_term=d%2526d+5e+advanced+player%2527s+guide PDF link annotation
    • http://wemorewabadeluz.mygamesonline.org/31280902730.pdfIn PDF document text
    • http://penageli.getenjoyment.net/87657509924.pdfIn PDF document text
    • http://xubanapirobula.mypressonline.com/wheres_waldo_online_game.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/14271522451.pdfIn PDF document text
    • http://sozapemogoz.mygamesonline.org/xadozavaxaxigixa.pdfIn PDF document text
    • http://nigodofifulo.scienceontheweb.net/annabac_terminale_s_maths.pdfIn PDF document text
    • http://vobalemujumojak.mywebcommunity.org/85955648678.pdfIn PDF document text
    • http://bimoriz.getenjoyment.net/electrical_actuation_systems.pdfIn PDF document text
    • http://rexuwoxaga.sportsontheweb.net/mother_goose_nursery_rhymes_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_8cfa5dea80724d4088de3ee296742a07.pdf?index=trueIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_b0ce74c886304c93893c0a21cada11bc.pdf?index=trueIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_369717eb22694e28ae6cc4149d9b4560.pdf?index=trueIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_a6d3aa2d51d243d496d833a19a9ced85.pdf?index=trueIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_539a8bc2509445e7855214d1bc171c0e.pdf?index=trueIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_c2c1df5b5dcc4ccfa055607a3e77116d.pdf?index=trueIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_9095fe518cd54aba9464cd9e6e056554.pdf?index=trueIn PDF document text
    • http://rosevasejila.myartsonline.com/bosch_silence_plus_dishwasher_wont_start.pdfIn PDF document text
    • http://gagolabirej.atwebpages.com/nijifufipo.pdfIn PDF document text
    • http://makakanow.onlinewebshop.net/61967298120.pdfIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_604b2eb1cc5f4c189e3f7a1a2b99b128.pdf?index=trueIn PDF document text
    • http://zirutabu.myartsonline.com/baskerville_a_sherlock_holmes_mystery_script.pdfIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_b9f7807ad9544c268dc7b9c7b91a7c95.pdf?index=trueIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_46d75885fb134f64ae7f7ae3d4f3fbd7.pdf?index=trueIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_52c9ae477c3f468d9f75d39c8e2c83e9.pdf?index=trueIn PDF document text
    • https://ee809a51-a58d-41df-a269-13688c4e1c69.filesusr.com/ugd/5f587b_3484320891804af794c2b43b500e1e85.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_off0000ed2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2C 4156 bytes
SHA-256: 5bcf7f318894cd8667f709bf970fa8c582a8027402ea75fdf14ac0e15260a4d2
font_01_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 10692 bytes
SHA-256: 056305416b03ed9a302d7a6c14daea7ba581316e3e2e2ed32920e8c81957a3a4