Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51006a2f25191cd…

MALICIOUS

PDF

70.9 KB Created: 2020-12-19 02:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79d2567ee413e1b33b9a9e7735ca3d9b SHA-1: 529954fe562ac1efb65048dec368ce57a4ca1307 SHA-256: f51006a2f25191cd2e360b4af0de41cdccaa883816925480e4b725c17159ec25
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one prominent link pointing to 'https://trafftec.ru/strik?utm_term=chrome+nail+polish', suggesting a phishing or malware distribution attempt. The PDF also includes a large number of generated SEO links, indicating a potential link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/strik?utm_term=chrome+nail+polish
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/rikedowisejixu.pdf
    • https://zafapeniledepur.weebly.com/uploads/1/3/4/8/134846756/rigudid-xujiwuvoguteg-jawirajake.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ravuxudibure/movie_apk_mod.pdf
    • https://uploads.strikinglycdn.com/files/908f324a-b485-40c5-88d7-22caa0141f82/biwojedugemipinoraj.pdf
    • https://s3.amazonaws.com/lowuwofuxali/baal_veer_1003.pdf
    • https://s3.amazonaws.com/kokesatodixon/the_magic_of_thinking_big.pdf
    • https://uploads.strikinglycdn.com/files/8fbab2d6-fd94-4719-a0c6-82618e6e72dd/53710849343.pdf
    • https://s3.amazonaws.com/fotojipifuzitul/69756019401.pdf
    • https://static1.squarespace.com/static/5fcdf4e94e85dd6b2514dddf/t/5fd6b4efe5ac5828962efb2d/1607906543556/neet_biology_questions_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/3646b44d-dddc-430b-b198-5ae678606094/nerazipunubutisulovebep.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1ebd08845d0924530f24/1606295230012/kolb_learning_style_inventory_12_questions.pdf
    • https://s3.amazonaws.com/xipavir/veravitivakoxibafiraxime.pdf
    • https://uploads.strikinglycdn.com/files/f12dbe30-9d36-44ba-adea-1db8f6dd44a4/subnautica_centre_de_recherche_sur_les_maladies.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d966.bin
85c6c3e1c4894c2d5fc85a1e8dcb34b51023083d3ea3b12567ce38e2c785bceb
pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 4964 bytes
font_01_sfnt_off0000ea10.bin
faa7d6ed043039e7fb6fe952955ecae8d6f4427f1ca76eb984370f92e55cae77
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 10984 bytes