Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c02930dcfd15086…

MALICIOUS

PDF

82.9 KB Created: 2021-10-04 22:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c513096e6ed95b7c4bac364a31ea7346 SHA-1: 4e7ea45fa7354cb952647051ad1555d256404319 SHA-256: 4c02930dcfd150864094e8498dd00307d3efc9550efc206f6f4809fba5e4fa4b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URIs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The presence of these links suggests an attempt to direct users to malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=small+red+bugs+in+bathroom PDF link annotation
    • http://jessie.vn/images/ckeditor/files/lalujawazepevugosa.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/67693408413.pdfIn PDF document text
    • https://terracell.info/images/file/zexazum.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/78884692492.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/65190628733.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/95737556646.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/76146229350.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/58651217653.pdfIn PDF document text
    • https://togeltop.com/contents/files/35139011985.pdfIn PDF document text
    • http://polkovnik.su/upload/file/fotupavilonotuso.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/sumuguwurabodumej.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/19980588690.pdfIn PDF document text
    • http://capital96.com/userfiles/file/rumovazanetisaxonodidogiv.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/nidusowuponamukiwez.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/35362375701.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/40653231742.pdfIn PDF document text
    • https://matricula.arendic.cl/files/wiwobesatinafinuj.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/25428731539.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/50057393491.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/422415405.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/29643888702.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6cd6ec66eb17136dc92fec539e6c0afa/jokepax.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_off0000dc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1C 18696 bytes
SHA-256: f091f0cb887d1433ece1e5864556dd447c6662d99a46d26f8c84cf37ad10a177
font_01_sfnt_off00010cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB9 11012 bytes
SHA-256: d2d527d9099bee666b6f3a9386cb795f4a0232ed4ebfbd856e5c4d3006b0fc00
font_02_sfnt_off000125d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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