Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85cd7505005b231…

MALICIOUS

PDF

99.7 KB Created: 2021-03-23 13:28:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 139f446fed66fd83a226cfb652ce4ee4 SHA-1: 030532b18f852d81701b49acf76275c6ee1ce562 SHA-256: a85cd7505005b231a112b5f2b1a4df2b34400162c91fb6c7e6ca9ef45f3700aa
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/strik?utm_term=arturia+minibrute+2+used PDF link annotation
    • https://zitavuzan.weebly.com/uploads/1/3/1/3/131379524/fopipipopoxexezewaju.pdfIn PDF document text
    • https://kogijusixi.weebly.com/uploads/1/3/5/3/135312463/2196378.pdfIn PDF document text
    • https://rikawoxazedopet.weebly.com/uploads/1/3/4/7/134772555/gofigutavewal-reboketizimiroj-rapovije.pdfIn PDF document text
    • http://f13x.xyz/cute_hidden_stickers_on_snapchatlbmz2.pdfIn PDF document text
    • https://redorofi.weebly.com/uploads/1/3/5/3/135383823/mifetijuwu-nifekazizux-rebili-zelavozabepu.pdfIn PDF document text
    • http://rukozhop-guide.com/does_the_bible_explain_free_willium1f.pdfIn PDF document text
    • https://xafukulirodut.weebly.com/uploads/1/3/1/3/131379356/8616111.pdfIn PDF document text
    • https://wuzezabor.weebly.com/uploads/1/3/1/4/131438899/8328566.pdfIn PDF document text
    • https://xixolediz.weebly.com/uploads/1/3/4/5/134513169/suxuxog_xujizuju_mirapowozut.pdfIn PDF document text
    • http://vetobiz.sportsontheweb.net/calendario_completo_serie_a_19_20.pdfIn PDF document text
    • https://sanajupa.weebly.com/uploads/1/3/1/4/131406847/1339310.pdfIn PDF document text
    • https://lafuxekezijunu.weebly.com/uploads/1/3/1/4/131406487/eb8c2.pdfIn PDF document text
    • https://paxupodef.weebly.com/uploads/1/3/4/7/134763896/puzekenena.pdfIn PDF document text
    • https://letezinujafi.weebly.com/uploads/1/3/4/9/134901841/4f5b43d17.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/autodesk_3ds_max_shortcuts.pdfIn PDF document text
    • https://jaxizunup.weebly.com/uploads/1/3/4/8/134885867/muvetemi_dovesuligotabeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_7605e9f3857e4b0b9b079ace3f74bd61.pdf?index=trueIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_85aca2cb06584b56b18ee90ef2a8f3c9.pdf?index=trueIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/66223422722.pdfIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_df74ca1cb28c41ffad7b0dea1d8e14da.pdf?index=trueIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_ed7b6a55df0544df96bba09f9443f54c.pdf?index=trueIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_3ac41ad20bd948edbef0e87b29e80a02.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD4 4972 bytes
SHA-256: 9baf523673870f6c7a7732e7bbaa8e48479380c3ea98f87f9396d99f5f8df444
font_01_sfnt_off00014c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C91 11480 bytes
SHA-256: c6029db01c8f3a27fb758490d10d8e5ae7f2f05e09a132e9adf29ba89a0d3acb
font_02_sfnt_off0001739f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1739F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f