Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2cafe969819576…

MALICIOUS

PDF

83.0 KB Created: 2021-05-29 15:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fe16cd16fda596a93c27caac285a6872 SHA-1: 9a5424d815e0790ffea91e6cb44f80b42252e55d SHA-256: ac2cafe969819576345a5be6751c9c04686addddf77d1b9de693f0ba72e643fe
186 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to manipulate search results or redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure itself facilitates the embedding of external links, which are the primary IOCs.

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=where+to+buy+bilva+plant+in+usa PDF link annotation
    • https://xogupugisi.weebly.com/uploads/1/3/4/1/134109029/finopaguvubokos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476294/normal_5fd6722ddab24.pdfIn PDF document text
    • https://vemewibikem.weebly.com/uploads/1/3/0/7/130776349/ad00d6216.pdfIn PDF document text
    • https://pagowabelada.weebly.com/uploads/1/3/0/8/130874520/ed61be128bea5.pdfIn PDF document text
    • https://nutiniwe.weebly.com/uploads/1/3/4/8/134870290/nibironaranuto.pdfIn PDF document text
    • https://fajubelikuvevut.weebly.com/uploads/1/3/4/8/134851309/perimawoxomimos.pdfIn PDF document text
    • https://nazugawexavidi.weebly.com/uploads/1/3/4/6/134678572/81040d5d85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_5fda7d0423583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_602f1fa732e6d.pdfIn PDF document text
    • https://zatikavetix.weebly.com/uploads/1/3/2/3/132303242/fcd6251ef.pdfIn PDF document text
    • https://zixixowiw.weebly.com/uploads/1/3/4/6/134605173/9717229.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/fd61111a-9bee-4aac-93fc-4fa57a88d6ec/which_singer_sewing_machine_is_best_for_quilting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b072ad-84a0-4f55-b715-9d8377be85c4/wugawipododuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ffb3da-c095-4633-86ab-a10a736cfd13/12958755340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a77afdb-658e-45c4-8a3a-a8978f902f51/can_you_break_your_lease_due_to_covid_19_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fe8c504-5292-41e2-be36-1bf2d95a0b01/66868150202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9482bad2-b827-44c1-aeda-d22ca90c7012/xapovafumawabajanipana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15388ca2-8ad4-4ba9-900c-7fde321917da/family_photography_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2150be46-6f92-4e97-bd0f-53e48ea8fa15/80367036332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/567d09f4-9e68-46f8-985b-f870a51161a8/can_you_try_on_clothes_at_old_navy_now.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fde243d-0ee0-40fe-8948-b4487afe558e/garmin_430_for_sale_canada.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_off000104a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 5220 bytes
SHA-256: 24b8f3689f38979cdc2b6c4965d0a99a57680aa11efc9f72058f63cb2a37d2f5
font_01_sfnt_off00011673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11673 12164 bytes
SHA-256: ce5f5fa856ad91d9be45ff8dce352671edaf33c6c5187628695e716f11e3d42c