Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc61ae71f56f6a85…

MALICIOUS

PDF

78.8 KB Created: 2021-03-11 01:17:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6db50697c06a88c6baea6d82ea854e70 SHA-1: f750271ce1c03ce0048723168ad38a36d89d34d8 SHA-256: bc61ae71f56f6a859fb14ec455d814af553498b294847b977cc7d758c2e3dbff
186 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ML models and ClamAV, indicating a high probability of malicious intent. It functions as a link farm, directing users to numerous external URLs, including suspicious domains like 'baarspo.ru' and disposable hosting services. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and references 'Google earth 3d map apk', likely a lure to entice clicks on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=google+earth+3d+map+apk PDF link annotation
    • https://cdn.sqhk.co/dijowasedop/u2fPkii/12119425937.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/hcjaPwA/dan_the_man_mod_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/lazuxorus/vgdXAzM/86040224521.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374373/normal_5fc6933cbfcfe.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/9855251.pdfIn PDF document text
    • https://zisediri.weebly.com/uploads/1/3/1/4/131411341/4761130.pdfIn PDF document text
    • http://hargotel.xyz/position_velocity_acceleration_graphs_worksheet_answers6azwr.pdfIn PDF document text
    • http://halfraire.xyz/pisosewuwrnpu.pdfIn PDF document text
    • http://makeyourself.xyz/23440469762r0x5i.pdfIn PDF document text
    • https://cdn.sqhk.co/javajadoj/VzUDghB/billie_eilish_bury_a_friend_lyrics_az.pdfIn PDF document text
    • https://cdn.sqhk.co/gotulurowav/wibJNje/tower_crush_hack_unlimited_money.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493209/normal_6046afcc20846.pdfIn PDF document text
    • https://kivalake.weebly.com/uploads/1/3/4/8/134885121/kavinimafalagul.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/midizaxopazeji/how_many_abortions_are_performed_yearly_worldwide.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/11824581820.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/android_studio_documentation_slow.pdfIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_132d618810a2428687ba9a1becb34760.pdf?index=trueIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_020902f648114e299ad1a91523bde1e1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sikuva/how_many_mock_exams_cfa_level_3.pdfIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_4501b82fd4d04594b117db98aa392d7b.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_4366194dfb584c0c93e6a2e2e7353fe9.pdf?index=trueIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_52befc2d5f194f778d1a550a0f47d895.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woneketelak/37930491273.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_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 5456 bytes
SHA-256: ba5100243df0bbfc562c38da7a6523211d4126667d6304f424166086d253c401
font_01_sfnt_off000109fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FD 10612 bytes
SHA-256: 17f5d95d41e6316f103bf483427de8265d3e8f49b98ebb8285ad7f6a5ea5887e