Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc9f51e95dcb252…

MALICIOUS

PDF

94.0 KB Created: 2020-11-22 00:35:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40682c3f0edab3c26798893e6ff4c29e SHA-1: a02cb437381baed2fbdb7140b33c6cd83fd8a0c4 SHA-256: 1bc9f51e95dcb2522d7dd4b3e5333e7a93e63089d93727a9028531ff1aaa833c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URL 'https://traffset.ru/aws?utm_term=android+studio+connect+to+online+database' is likely part of the malicious infrastructure.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/aws?utm_term=android+studio+connect+to+online+database
    • https://cdn-cms.f-static.net/uploads/4421207/normal_5f97071587986.pdf
    • https://tojopuxibo.weebly.com/uploads/1/3/4/2/134265943/4346953.pdf
    • https://tekoxinir.weebly.com/uploads/1/3/4/6/134606092/turoguxejatow.pdf
    • https://cdn-cms.f-static.net/uploads/4451033/normal_5fac3a6a1ed12.pdf
    • https://xexofukirusolim.weebly.com/uploads/1/3/4/8/134871283/goxad.pdf
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/9039740.pdf
    • https://lopodudox.weebly.com/uploads/1/3/4/3/134339354/nixelame.pdf
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/soxuboxesumexi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nabifovu/81022746756.pdf
    • https://s3.amazonaws.com/somamere/whirlpool_dryer_duet_manual.pdf
    • https://s3.amazonaws.com/pazifetanegapu/beyond_compare_without_installation.pdf
    • https://s3.amazonaws.com/fejififimaketo/roblox_apk_modded.pdf
    • https://s3.amazonaws.com/lupebesu/cateye_velo_8_instruction_manual.pdf
    • https://s3.amazonaws.com/dewazewokib/ashampoo_burning_studio_14_full_crack.pdf
    • https://s3.amazonaws.com/fapaga/tp_minecraft_ps4.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_off000134c5.bin
5be6b696b5e8c0bdc3a86a373db46ee15b67295b51f8d0ba9e6e032c27c0e484
pdf-font-stream PDF embedded font (sfnt) at offset 0x134C5 5060 bytes
font_01_sfnt_off00014604.bin
922db7f203f2815e6842705044f2fa6fa8927a270aec2ab1c7940a689a343a89
pdf-font-stream PDF embedded font (sfnt) at offset 0x14604 10748 bytes