Malicious PDF — malware analysis report

Static analysis result for SHA-256 1789dcf84a9c5f9d…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 03:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 492aa6df92aeea087e42fbaf19e0ee81 SHA-1: 570629cc5b34ada864d69ca3791856c19e00c488 SHA-256: 1789dcf84a9c5f9d8a8da64918fde21eb0ef31427f563a5f131ccb3a491fa877
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous external URIs suggests an attempt to redirect the user to malicious sites. No scripts were extracted, but the PDF structure and heuristics point towards a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://huntic.ru/uplcv?utm_term=offline+best+games+android PDF link annotation
    • https://pristineleather.com/userfiles/file/43011163437.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/puwivumadewojikazuku.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/jofowaneg.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/subamufobodifoxegu.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/lobuxorefokaxoxixagumu.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/65876676430.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/28064030746.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/48052516486.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/moripolofonozesi.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/63708819089.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/fijupimelumuf.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/pixafopo.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/21572174072.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/pebipe.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210912025029.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/48662734879.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65244027502.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/povefejedafis.pdfIn PDF document text
    • http://orlickachata.cz/files/files/sezax.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/67b805728bff38e2236e7754c42beda8/kulonuxenamizedinewi.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/kisorivupugupabow.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/98649893763.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://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_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 16856 bytes
SHA-256: 75a0536d5de45cbca018159ae511da027389697118f986137a72ef5afc045895
font_01_sfnt_off000118c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D9 10860 bytes
SHA-256: 101efcd7a0a277ee516b665ba7cf1465c033fbce63f3c61c8ac838e06a034dd2

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