Malicious PDF — malware analysis report

Static analysis result for SHA-256 3985925fd76c8b7b…

MALICIOUS

PDF

86.6 KB Created: 2021-03-11 22:09:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 89a20194296c85de23860c33259acd68 SHA-1: c57141a7bac5b9caf6bf127576bcf4d9eaf02bb3 SHA-256: 3985925fd76c8b7bdb455e999adb9c8b49f8ecce2527cfbc0ca2760cc3d92453
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate this behavior, and the ClamAV detection confirms its malicious nature. The embedded URLs likely serve as the initial point of contact for a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/123?utm_term=converting+cdr+to+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380230/normal_600c832bb16c5.pdfIn PDF document text
    • http://setokanekema.mygamesonline.org/69670655996.pdfIn PDF document text
    • https://pipenibeteza.weebly.com/uploads/1/3/4/5/134508730/lapozi_juxeb_togeb_nujutodaku.pdfIn PDF document text
    • https://tipipiteker.weebly.com/uploads/1/3/0/7/130775441/mejimin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486193/normal_6026a2dc02356.pdfIn PDF document text
    • https://kanumipiga.weebly.com/uploads/1/3/5/3/135346224/kuzaf.pdfIn PDF document text
    • http://matawobedopikam.mywebcommunity.org/8375282453.pdfIn PDF document text
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/7180555.pdfIn PDF document text
    • https://webemimerur.weebly.com/uploads/1/3/1/3/131380848/gopesikelazum-rofaboxore-pinodokujutip-rujoliworuxafo.pdfIn PDF document text
    • https://gafukarufigak.weebly.com/uploads/1/3/5/3/135309608/0a09978505c213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_600c11b49011c.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/Ikheid8/xogogodu.pdfIn PDF document text
    • http://fesufobototezer.mywebcommunity.org/rolik.pdfIn PDF document text
    • https://jazejuvo.weebly.com/uploads/1/3/4/4/134439384/90ba5bd6c.pdfIn PDF document text
    • https://nasoxuxelaleve.weebly.com/uploads/1/3/4/7/134744481/lopababinale.pdfIn PDF document text
    • https://cdn.sqhk.co/beledufe/Agglnhj/word_finder_anagrammer.pdfIn PDF document text
    • https://disumudumoronu.weebly.com/uploads/1/3/1/4/131408153/23444fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388813/normal_5fc7506d591a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/masevewi/ccat_audit_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/character_traits_worksheets_for_2nd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/dubima.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/rovedupifemorejafilojet.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_off000118e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E1 4868 bytes
SHA-256: c1bf61ba13e9a18022110a4a19b882bc19cd59ef2e62feb9ca691b2c561cbc26
font_01_sfnt_off00012990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12990 10540 bytes
SHA-256: 972e42e338749dff34022c2affda2cccef7bdf1898a54d6142ff612c70cd3cfc

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