Malicious PDF — malware analysis report

Static analysis result for SHA-256 b867c2c63cb08bbb…

MALICIOUS

PDF

67.1 KB Created: 2021-02-24 14:29:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d73f5ad6cd030967b120845879964d00 SHA-1: d1d44e8f270b76241586b06bb3911c93c133acd7 SHA-256: b867c2c63cb08bbb5fa7539fc7445aa6cb3199a7be34933048aaf710c4bfc8dc
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to be a lure for a 'wireless n repeater wps connect' download, which is likely a pretext for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/award?keyword=wireless+n+repeater+wps+connect PDF link annotation
    • https://xitirume.weebly.com/uploads/1/3/4/3/134392652/xowoxe-feses-borulivi-jimasabolowurid.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/agjR512/vokosomonirapivamifijopij.pdfIn PDF document text
    • https://cdn.sqhk.co/tirazirevemu/eiaid6H/59486439933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_601e11d05f820.pdfIn PDF document text
    • https://powelogub.weebly.com/uploads/1/3/1/8/131871449/6207085.pdfIn PDF document text
    • https://nitevafatuva.weebly.com/uploads/1/3/4/8/134872456/paxegenufirenem-levedew.pdfIn PDF document text
    • https://mujekakuvegaxum.weebly.com/uploads/1/3/2/3/132303245/ff11c63.pdfIn PDF document text
    • https://sebinegovana.weebly.com/uploads/1/3/4/0/134095930/mawupunibumapal.pdfIn PDF document text
    • https://nalelijuw.weebly.com/uploads/1/3/4/5/134512153/734355d90a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385859/normal_5ffa0841afbf2.pdfIn PDF document text
    • http://nesobaka7.xyz/guzixaruwp1lqp.pdfIn PDF document text
    • https://mufanujirube.weebly.com/uploads/1/3/5/3/135348440/bipibexagikotojixu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384045/normal_600f99e794933.pdfIn PDF document text
    • http://13millions.store/6855799829gn6e0.pdfIn PDF document text
    • https://cdn.sqhk.co/reruzemafow/bhcMLhe/lyrica_dose_for_fibromyalgia.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/VeJReNR/11088305865.pdfIn PDF document text
    • https://cdn.sqhk.co/xunixenovapi/jjggjih/gumezutef.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/9003954.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/buxoparadazegu/95256832213.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/carry_on_jatta_gippy_grewal_song.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_off0000cc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC35 5032 bytes
SHA-256: f5e3fd819635d8e0b80fcddc87bae743740cd385c8a7bea2a8281e8a41d66576
font_01_sfnt_off0000dd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD78 10004 bytes
SHA-256: 6c29846118a49055e27873ec3e1a165784b8682d5a3d2d8b74d9b29a9206c340