Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8787a8ab17ac364…

MALICIOUS

PDF

75.6 KB Created: 2021-06-08 13:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2c0324c2e73a1908a320f3ac7a39026e SHA-1: 3cbf1cfbe5872032042f338237b0f39274c9f193 SHA-256: a8787a8ab17ac364c48313ec507f8feb195a62afa2eb7198a3d5b3e799173102
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution scheme. The primary URL, 'https://irlanc.ru/pbw?utm_term=hack+mod+apk+download+for+android', explicitly lures users to download Android applications, likely as a pretext for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://irlanc.ru/pbw?utm_term=hack+mod+apk+download+for+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370092/normal_5fe8545d7f7e9.pdfIn PDF document text
    • https://juxewuvolexi.weebly.com/uploads/1/3/4/1/134109000/4ffcf5.pdfIn PDF document text
    • https://zasefijokadi.weebly.com/uploads/1/3/4/6/134667753/369e9b06a6b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374198/normal_60b8349aca5d0.pdfIn PDF document text
    • https://nodepinanobepex.weebly.com/uploads/1/3/1/3/131381288/bupixavizomerefufum.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4450721/normal_60b493c817d89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417414/normal_600f4ae7af258.pdfIn PDF document text
    • https://loneluripovulom.weebly.com/uploads/1/3/4/3/134364014/f02550ff2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375194/normal_5ff314ecbbdd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_600dd95b3feda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489255/normal_604e4513986d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502439/normal_601ced55ca00f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_600f3a8501533.pdfIn PDF document text
    • https://dojukigefob.weebly.com/uploads/1/3/4/5/134577696/3486168.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/c6aff6ef-bb8d-4965-8e3a-81323f8356a2/kenmore_high_efficiency_washer_error_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e1c81f9-dadd-4567-a358-9bd06ec20461/kukojegutavaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7156b354-b70d-42ba-b058-88beca6bf3bd/takogagefarolibatoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07f05339-7135-443f-96ca-1beceb747ce5/xidabasujisizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d2def53-6d6b-4ed5-8c83-fc991a387ca3/17346924494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aaa7ba4-a901-4cdb-8430-feeb90532978/wigotemitog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87392b5a-cf58-43be-a6d3-d914c40d9b1f/what_are_the_main_component_of_a_mission_statement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da06a004-ab5b-47a8-82e3-f35cbbc35974/58198017929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbee4c2b-98fc-47ea-a6a6-a81f83b8b497/how_to_clean_the_pump_drain_filter_on_a_maytag_maxima_front_load_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c5d3d6-7252-4434-89aa-0fbd39dd2d86/fe_exam_prep_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5d317bd-83b6-4086-a054-bc97f2002a79/mejidomige.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_off0000e91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91F 5240 bytes
SHA-256: 63ade13d469d71b862f2e59ee768ac1ddfc23c6dce235c4d2e0811a65eedc632
font_01_sfnt_off0000faf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF3 11308 bytes
SHA-256: 543841482cd35c85f9d39965ff16af4502fc4804c844d95aa0e45ca20df54bc0