Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4ffaf35d3cb801…

MALICIOUS

PDF

77.3 KB Created: 2021-05-28 09:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b273997cbb154e7ca71ca4ed7f24095f SHA-1: 3cc8017cd9b65a36d6d3961bdd523bf10036bc0a SHA-256: 7a4ffaf35d3cb801d2df0033d732b84ce81f39fdc990efdd2369a9f03ae98862
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a large number of outbound links designed to direct users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=how+can+i+unlock+my+laptop+bios+password PDF link annotation
    • https://sajixigepanosu.weebly.com/uploads/1/3/1/0/131070231/gifaperuxosun.pdfIn PDF document text
    • https://vimefipivarek.weebly.com/uploads/1/3/4/3/134310944/bixalenapalinitu.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/neluvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450147/normal_606bffb83ed16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497358/normal_600f1f87543e7.pdfIn PDF document text
    • https://zomurudol.weebly.com/uploads/1/3/4/4/134492975/zanit-tufalelegofulu-besogezaj-jisigorirosaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418191/normal_60274d7ca714f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374715/normal_6054bd977bba4.pdfIn PDF document text
    • https://kumaneke.weebly.com/uploads/1/3/4/6/134682587/xunuzixeta.pdfIn PDF document text
    • https://xemexetizepe.weebly.com/uploads/1/3/6/0/136094173/9895260.pdfIn PDF document text
    • https://rixidagetowema.weebly.com/uploads/1/3/4/6/134612143/setolubapedepibevaka.pdfIn PDF document text
    • https://vemulasi.weebly.com/uploads/1/3/4/5/134509822/zofoxuselek.pdfIn PDF document text
    • https://regajuwanuduxis.weebly.com/uploads/1/3/4/3/134319991/1ca0fe1e563.pdfIn PDF document text
    • https://karejebesowe.weebly.com/uploads/1/3/4/8/134875170/vexuja.pdfIn PDF document text
    • https://pifilapife.weebly.com/uploads/1/3/4/3/134376120/8647023.pdfIn PDF document text
    • https://kimogixolemalo.weebly.com/uploads/1/3/5/9/135964987/3202927.pdfIn PDF document text
    • https://xutepodufolesik.weebly.com/uploads/1/3/0/7/130739265/6009733.pdfIn PDF document text
    • https://zidoboxeped.weebly.com/uploads/1/3/5/3/135324118/suvefaweliketisoli.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/73b1c5e0-7376-4991-ba66-ceb6ba1a8c72/how_accurate_are_acurite_hygrometers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/849259d4-74d9-4aa7-ad2a-7f98504cb9db/watch_cheaper_by_the_dozen_2_online_free_123movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78f6b572-11e0-40eb-a944-1f4dbb708e02/pandigital_digital_photo_frame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6354bd97-2b84-49bb-9434-22953dd7a513/sennheiser_ew_100_eng_g3_wireless_microphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/456218aa-1a8b-4858-aff6-2aa1da7595e9/what_are_the_interview_questions_for_technical_support.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_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 5580 bytes
SHA-256: e58ef35de7b6064adc77da845ce10e41deb0571c4801a637ac47f597dc1b2ea8
font_01_sfnt_off0001025b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025B 10972 bytes
SHA-256: e8607087fc0be5d3c40d4b2a834db80f4a72b8876ae569bf537eca27cfede132