Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f71590e7b60cbc0…

MALICIOUS

PDF

78.3 KB Created: 2021-09-19 03:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f7d09308be5c0e275256f94aabb8003 SHA-1: 6497a81ce4b95eaa5bea434365c7b365d542c88c SHA-256: 3f71590e7b60cbc05da110f26b0ab4a3ba58d5e4e5bb615bce015c73146200a5
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic 'SE_CALLBACK_LURE' strongly suggests the document is designed to trick the user into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were extracted, the document's structure and embedded URLs point towards a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://wanna-drive.nl/files/File/zotakimewosesilalizi.pdf In PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ffntqjjna3bk0nigpdm9mr43g8/51473861753.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///38121824614.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/14b8f0a4a43fbcaaf1ad86c54e227dae/jukuzaja.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/kinimuwuxilemenubej.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/25015441564.pdfIn PDF document text
    • https://mkontroll.hu/File/69161660329.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/susomaru.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/60092494594.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/80471085463.pdfIn PDF document text
    • https://agros.net/uploads/file/bevomiwimakoxejolabi.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/77034708175.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/17578487493.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/42084699335.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/77036743927.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/gixadurorovof.pdfIn PDF document text
    • http://salt17.com/userfiles/files/mudujaboxava.pdfIn PDF document text
    • https://dintek.eu/uploads/file/77414149461.pdfIn PDF document text
    • https://jobtiara.com/files/files/35564637074.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/31372391742.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nulaz.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/jajuduzopenana.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/59990297819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=call+of+cthulhu+rpg+free+pdfPDF 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_off0000cb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB83 18500 bytes
SHA-256: e82c8a2206d26bf7ce17e627d9b5aab06b443e7f68529e5dc0ce64e9a7337330
font_01_sfnt_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001135b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135B 10668 bytes
SHA-256: 89cb8ec9abd1667ba49cb851b683519068ec24cc2217eccb326871ac7228423c