Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a0213b917adc9d…

MALICIOUS

PDF

78.8 KB Created: 2021-06-01 08:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e7c8a5312e62efd59e642a072501d8dd SHA-1: ea4b6e312a8d50628b4d289e32bc75052fa92d37 SHA-256: a8a0213b917adc9dc70f0f24623b173028b4744a76c118113ce87e3b9302575b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and includes a 'utm_term' parameter suggesting a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs point towards a lure to download potentially malicious content.

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://baarspo.ru/123?utm_term=battlefield+4+apk+obb+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378175/normal_6015c5dee0665.pdfIn PDF document text
    • https://vunufagedumuved.weebly.com/uploads/1/3/4/7/134740761/996d7756a65e.pdfIn PDF document text
    • https://kotutoxegaru.weebly.com/uploads/1/3/2/6/132695780/dapiruxagivepux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_601b311b601a6.pdfIn PDF document text
    • https://womogidukiwu.weebly.com/uploads/1/3/4/8/134873304/f7ae432fdae6.pdfIn PDF document text
    • https://nojevuxosat.weebly.com/uploads/1/3/4/3/134357696/sirofipokil_tavebunesew.pdfIn PDF document text
    • https://sirazetagur.weebly.com/uploads/1/3/5/3/135328448/lajarapixe.pdfIn PDF document text
    • https://ferafavobob.weebly.com/uploads/1/3/4/6/134671558/bisafilivoxovo-karodivatagaje-fotusoduxoviw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467277/normal_60281f000ec24.pdfIn PDF document text
    • https://ruwufinojib.weebly.com/uploads/1/3/4/6/134643146/8557484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446782/normal_6063c76cc9ca4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_604187e03173c.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/10865ca1-2240-4952-9641-7957907f0074/vetitisolexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bda18c0-7517-4c0b-bde3-a447f3bbdc57/xokaxagedinixoranimitud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4c3795e-3b29-47a4-a84e-8333462dd66e/introduction_to_operations_research_10th_edition_frederick_hillier_and_gerald_lieberman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5bf55d4-323e-4644-97af-a9db15366596/968193653.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab35a538-569f-4177-8fb9-f1fc0414ac5b/mokiduzavosufuximisig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1df234f3-bc38-439f-a8fd-e8fad7d3857d/the_bro_code_rules_barney_stinson_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d69b48bd-4dbb-44ee-968e-e50183fc42da/40695987322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2b445d9-d584-41b5-88df-a197d088bfed/43737300661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfc13a8c-bdd4-48aa-ae6b-a11ec9b368a2/valowodiwatabexedo.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_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 5196 bytes
SHA-256: 0cdc0a5617f4f9259478cffdad099e6aa5240805d5d266b6c115e53e0bc7b43b
font_01_sfnt_off0001078e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078E 11536 bytes
SHA-256: ac658b2596e5b3926b30cd5887c0fe08d1165c3e332025b7000c86df819acacf