Malicious PDF — malware analysis report

Static analysis result for SHA-256 51091c8cc7ea4108…

MALICIOUS

PDF

75.5 KB Created: 2021-02-23 12:45:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ba99a5b9776c626dfd709d4fc4dd2135 SHA-1: c77bd8a3f84f55fbd313c35819aa127c6d339beb SHA-256: 51091c8cc7ea4108cee5ba582033f851aee7a13d17ebc248b9cd815b92f3e63a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous external URIs, many hosted on disposable domains, forming a link farm. The document body, though heavily obfuscated, suggests a lure for a free album download, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://leonvi.ru/wix?keyword=tyler+the+creator+flower+boy+full+album+free+download PDF link annotation
    • https://xipumizi.weebly.com/uploads/1/3/4/7/134746986/7422735.pdfIn PDF document text
    • http://milanbeachs.space/road_trip_travel_planner_freesvnuo.pdfIn PDF document text
    • https://cdn.sqhk.co/lidupusumoj/FThcjaD/94129224344.pdfIn PDF document text
    • http://contact-git.top/foxit_printer_driverzdyhm.pdfIn PDF document text
    • http://smilex.club/pefubolisomazororifduec.pdfIn PDF document text
    • http://tourist.fish/toyota_2.5_liter_engine_specsaa3h4.pdfIn PDF document text
    • http://denizan.com/yahoo_news_rss_feeds_listx8kwh.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/MgUVifP/47296923414.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/taHijia/foresevewusewejisipuxamob.pdfIn PDF document text
    • https://semuvobe.weebly.com/uploads/1/3/0/9/130969465/liralexojoxosowo.pdfIn PDF document text
    • http://xtreme-sport.ru/781113832299pivt.pdfIn PDF document text
    • https://wokulenazaxur.weebly.com/uploads/1/3/4/7/134744474/0407508d87.pdfIn PDF document text
    • https://towowiwegopute.weebly.com/uploads/1/3/4/0/134019464/c2351797.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/faxaxos/cpwd_works_manual_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/23498766003.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/where_to_donate_furniture_in_mercer_county_nj.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_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 5364 bytes
SHA-256: 3a0c3804bedb09c4069ba673fb20326cc8ba8a7ad7e10f0e8dd0fe76093d9436
font_01_sfnt_off0000f858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 12476 bytes
SHA-256: e2c59db886d2f975dbf00beb986009a8a16f97e5c26962d171fb3b46e7203cfe

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