Malicious PDF — malware analysis report

Static analysis result for SHA-256 914f082a0f897865…

MALICIOUS

PDF

74.2 KB Created: 2021-09-23 15:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eaa5d436de259cd719c835ae0f4877ad SHA-1: 9240d7a89a83f096e463e466a8b83700786b909b SHA-256: 914f082a0f897865f852681535c12e42e35ecf533bc9a49c2665ce2e29f221c3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of phishing and callback scams. The document body is heavily obfuscated, but heuristics indicate it functions as a link farm and potentially a callback lure, prompting users to contact a fraudulent entity. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://hardlineconstruct.ro/app/webroot/files/userfiles/files/lelojetibusigukepovusise.pdf In PDF document text
    • https://mauspro.net/upload/files/ladumumefimigijow.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/vojemeki.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/52390203617.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/64847878657.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/28632139415.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/35014083306.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/fujukizevag.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161325d3d7fcec---70649366040.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/bexubawurejotaluf.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/lodilijobesu.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/31960596724.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/zupekifogesobupi.pdfIn PDF document text
    • http://cpviettin.com/upload/files/93255157015.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3f354b8b4---difabuju.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/17432665522.pdfIn PDF document text
    • http://rilta.net/userfiles/files/13575022777.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///xovevitumadutisogoduv.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/35952918859.pdfIn PDF document text
    • https://digireg.nu/upload/videvubu.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/69237003388.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/87605617015.pdfIn PDF document text
    • http://apicn.net/upload/files/54518969374.pdfIn PDF document text
    • http://agilesolutions.in/uploads/6828019425.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/vonegukajufasadijowapete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hotstar+mod+apk+free+vipPDF link annotation
    • 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_off0000bf98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF98 10660 bytes
SHA-256: fd2816802ba349671fe8924ef8729961f38f3d9d8a08d75ab71bd001ca13ac92
font_01_sfnt_off0000d815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 16884 bytes
SHA-256: 44db2f5895367851621f3094729d97de3fd6ab88cd44711be2f9677a9a51f88f