Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab374a3b45f5d563…

MALICIOUS

PDF

75.3 KB Created: 2021-10-04 16:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5cda4392560b7a348c6725b8cd2270f3 SHA-1: 8fe0f1930a6093379d007f1be4526cb0383636a3 SHA-256: ab374a3b45f5d5637c529285022c2329c0c7099128aa1becc3d644d93a21f163
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it is a link farm and a callback phishing lure, suggesting it aims to trick users into calling a fraudulent number. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://getampedmag.com/ckfinder/userfiles/files/xugipefevo.pdf In PDF document text
    • http://gibisch.org/files/files/10607132825.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zobawamuwafedawe.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/janefefigagimokibesepiwe.pdfIn PDF document text
    • http://asustainable.com/global/file/misoxeredurufabet.pdfIn PDF document text
    • https://susta.vn/userfiles/file/pemejelan.pdfIn PDF document text
    • http://rhondachem.com/d/files/54393365320.pdfIn PDF document text
    • http://www.pilartangguh.com/file/ripijotol.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/64053170412.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/waruku.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/bovejuf.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/bipazewowenez.pdfIn PDF document text
    • http://atomleasing.ru/media/File/nagulakakasujika.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/55879422010.pdfIn PDF document text
    • https://plasterglasgow.com/fwd_docs/file/49282154444.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/bidojiburopekijexojut.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/84116939226.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/19344540792.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/19484948469.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/naxenoselese.pdfIn PDF document text
    • https://qud27rxl1-k61l.com/contents/files/wosomikunewolebate.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/kekofijetumufuridozejojeg.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/77976666326.pdfIn PDF document text
    • https://geloracinta.com/contents/files/72341221376.pdfIn PDF document text
    • https://ottopianos.nl/files/90658591155.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/xiwot.pdfIn PDF document text
    • https://codeforcesIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=equation+sums+for+class+6PDF 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_off0000c08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08C 17612 bytes
SHA-256: 7505325ddd96963b5f0705cac53d3329cd997033b3f51467f2724e39a478ae6b
font_01_sfnt_off0000ee3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 10760 bytes
SHA-256: aaa3740a0f6ae226a7bd1bcab46ebb6a84e9b9d8e58d42f23e77277f957f2939
font_02_sfnt_off000106fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1