Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a873be768bfb0a…

MALICIOUS

PDF

90.2 KB Created: 2021-02-28 14:20:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 06636c02e39493c11dc42d8579bc3804 SHA-1: 15602efc0fa2134b9fa1c6b08b926346cf7c748e SHA-256: 21a873be768bfb0a022dfb237f23b650633bdd221a944c6c4fca2acf73ace6d4
166 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links to disposable domains, suggesting an attempt to distribute further malicious content or facilitate phishing. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs users to open a password-protected archive, a common tactic to evade gateway security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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+to+pair+disney+circle PDF link annotation
    • http://beruvutekimeged.22web.org/52627726558.pdfIn PDF document text
    • http://flymoney.net/chopsticks_netflix_movie_freeg6vux.pdfIn PDF document text
    • http://fakaripeti.xyz/6870920385bvzef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_602d96f3cb0ae.pdfIn PDF document text
    • https://voxaxaloxedifuz.weebly.com/uploads/1/3/5/3/135399296/197789.pdfIn PDF document text
    • https://mimejomukokije.weebly.com/uploads/1/3/4/5/134510045/gebuborasojediwop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422385/normal_601cf150a0a19.pdfIn PDF document text
    • https://lidutefavova.weebly.com/uploads/1/3/4/0/134012516/4808173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491670/normal_6030e7e53d616.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/generac_5000_watt_generator_troubleshooting.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 5008 bytes
SHA-256: 182ab2350f6758e8cf42779a658773d41557fc8aae89421f4ccb2c072cb33dbf
font_01_sfnt_off0001086a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086A 2576 bytes
SHA-256: 5b39e9209f2f5823ace8c91dcdd9d22e48f67d4c3a8bd5da9fa9055417ac3ba4
font_02_sfnt_off00011229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11229 10468 bytes
SHA-256: 99be04a39cb1cf98d817431b4ee8e1727ce119597a9817d06b93a240946b09b9
font_03_sfnt_off0001362a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362A 16208 bytes
SHA-256: f76e53b1165c770ea72ceccb5e808e1d48d2b426d0b5e274530350a00bad707e
font_04_sfnt_off00014b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B69 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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