Malicious PDF — malware analysis report

Static analysis result for SHA-256 067f02768d8814f6…

MALICIOUS

PDF

85.6 KB Created: 2021-10-05 18:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 93c6cd63feec5833c51cbf6fa6d4d30c SHA-1: e92bd5b28f0bcf33a8da4bdef4403f37335c69b1 SHA-256: 067f02768d8814f63db5e2829d64af2b4550fb41b79b9f55ddea657e290f0049
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or credential harvesting campaign. The PDF structure itself is also suspicious, with duplicate object bodies and a high number of external URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=advantages+and+disadvantages+of+linear+model+of+communication PDF link annotation
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/50145510382.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/dizalajisopugujub.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/49988249542.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/pamiwiji.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/60232574916.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/renosupoviranemigugovozi.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/nebevupa.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/4561183923.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/gejupazipusojerobujo.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/33069539633.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/korifarajupu.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/34915193830.pdfIn PDF document text
    • https://felixtrail.com/imagini_ws/bukobizafulusev.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/vilivulof.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/sasuxefunatakufajasemub.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/guzabuvivifetekulisuv.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/69429724186.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/pikogidokopizonu.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1112883d7aac8571054517dcd59aa5d1/69463337503.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/dusefuroliri.pdfIn PDF document text
    • https://guijek.com/userfiles/file/93843276044.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE710 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF22 18532 bytes
SHA-256: 0a2bf7f5ea3165564de0a0a101efdb8225fe50c64eb2615b699338410a026698
font_02_sfnt_off00012ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE6 10964 bytes
SHA-256: 245ceb106ca6d0e9508a62258f7cd6074eb969e65813b09436b7f8b19068781e

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