Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f79789b6f6d44a…

MALICIOUS

PDF

75.9 KB Created: 2021-09-27 14:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3ecc44fc5afbe4249437549fc2bc9925 SHA-1: 1bc3bbca9ebbd1f9dba3eea484582b6c79e9864d SHA-256: b3f79789b6f6d44a945f6affdaffd1e176c344bf258060386f41d4298e22ba50
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further support the malicious nature of this file, indicating it's likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=como+adicionar+conta+gmail+no+android PDF link annotation
    • http://vnndt.com/Images_upload/files/zutulujoxuwulizewaxam.pdfIn PDF document text
    • http://oodow.cn/upload/file/210909132315109578l9e7vh6j16jv.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/jozatolekabumuvapapemelad.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/46088671730.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/gebipatawamemu.pdfIn PDF document text
    • http://konberdbio.com/upload/files/pofoxixudin.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/63715267474.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/90104095961.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/rekixeg.pdfIn PDF document text
    • http://electric-kernbichler.at/93292544264.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/51717986841.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/vidasupavigag.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/wopejavora.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/98850626945.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/dovatijaf.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/pizap.pdfIn PDF document text
    • https://hgb.se/filer/file/1857403933.pdfIn PDF document text
    • http://pfollowers.com/ci/userfiles/files/dutilizibur.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/gepuxekurizuwakogus.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/fiwamaxel.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/64142469085.pdfIn PDF document text
    • http://atomleasing.ru/media/File/zupitupataj.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/xegibox.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_off0000bfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 19336 bytes
SHA-256: d7f70f1f2ef4f61b49c11a67667d5478f2651c18732adde2bfa0a348a926a4c2
font_02_sfnt_off00010a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9C 10444 bytes
SHA-256: 136972b25f59e82a09a82b01b7afded33c404e231a607bc39965d28e5b5717e4

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