Malicious PDF — malware analysis report

Static analysis result for SHA-256 646c82e810fbdbbf…

MALICIOUS

PDF

74.6 KB Created: 2021-03-27 10:30:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f1b605bba7e59bcc1eea59fbcb314435 SHA-1: 1c5440bbf6cd352800a408e41ba5e002b01a0fde SHA-256: 646c82e810fbdbbfe5cbf9d8d27cb57fe27853708ca5ed084ddc0b56a45dcc62
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 0.9997

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://ponafet.ru/123?utm_term=expense+claim+form+template+word PDF link annotation
    • http://mufutekuson.getenjoyment.net/zigezow.pdfIn PDF document text
    • http://xivazokib.medianewsonline.com/b_ed_syllabus.pdfIn PDF document text
    • http://suzamakulamuj.mypressonline.com/tusuvovuna.pdfIn PDF document text
    • http://storezone.info/excel_vba_mid_instrrev02l2n.pdfIn PDF document text
    • http://gufutaca3.xyz/cengage_physics_mechanics_1_solutionsxkznb.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://healthyforczechrepublic.site/tulokokibexodovuv4u888.pdfIn PDF document text
    • http://dupuladusudired.mypressonline.com/98543532546.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e8968cf-1385-49c2-8b74-3803736b7ee2/36818446500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad304839-536c-4b23-b251-bbb778132a6f/how_to_save_your_sims_3_game_when_its_frozen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da4b807a-4092-4323-9afb-e54f9f92e1b9/1-4_high_offense_vs_zone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c37444c1-1525-460a-be8b-04d2ba3ccd89/kefelalebizakupovejasil.pdfIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_c2d5b67dec134674b2acc3ed29c451e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d17d8344-d040-4656-a7e7-e47f364cdca7/bofiwevibilesudagoxafeba.pdfIn PDF document text
    • https://6da1ed31-7a22-45b0-8bc5-463d376071ee.filesusr.com/ugd/29fbaf_d233877147d041f9a8c64a7a9745a328.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/28f0ccb2-cc18-46bf-9877-07d9a5577e39/what_psi_for_plasma_cutter.pdfIn PDF document text
    • https://313cea95-bd78-4864-9d9d-3b26c3bbe0bd.filesusr.com/ugd/2142af_1f1ab568ad2a4a1982838e27a7f26cc7.pdf?index=trueIn PDF document text
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_a442448e0920463495549da5ae8af86e.pdf?index=trueIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_1d20313c46e6438b88171d10226489af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c89ccea-2d0a-4b1a-9a8d-f342bc44a414/they_poured_fire_on_us_from_the_sky_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f39ccca-0a57-423a-9667-a5eb16afa83f/demifugaromonolujex.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 5416 bytes
SHA-256: a50c877132be35984504b7b2e8972d54c847bc670a72382288c7051f79309272
font_01_sfnt_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 10224 bytes
SHA-256: 5b8de015ff10274bd0fb6c487ab7b403e9e2f09cdfd0ca728f04089405dd3c94