Malicious PDF — malware analysis report

Static analysis result for SHA-256 106c4f6e9570bdca…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 15:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5a20255146f32c7b8d28b649de158edf SHA-1: bde5113103c56fa5a564254ad3c5c5e3e6e8b3a0 SHA-256: 106c4f6e9570bdcaa68ac7e11e97118b2752abd54adecd0b2ed0e6639f9a82ba
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. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains, with one URL containing a 'utm_term' parameter suggesting a phishing lure. The PDF structure itself is also noted as having duplicate object bodies, a common obfuscation technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=jason+bourne+6+online PDF link annotation
    • http://coachhouse.info/assets/file/jixafunejurevefefufip.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/pubofagapotodakowegej.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/ludeboza.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/jifofiligebati.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/dupepavos.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/94472490883.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/baxofowa.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/53275740409.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/12933017045.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/zoluza.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/35840277729.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/gewogugerugokejere.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/71075882437.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/53206274452.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/49245530518.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/bonudomisitogatipeginas.pdfIn PDF document text
    • http://hotechike.com/files/files/67760146180.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/78196652606.pdfIn PDF document text
    • http://devveb.net/userfiles/file/basikezanilorefozalozaz.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/lefef.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/74948538511.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/95943008352.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/24346825604.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_off0000d478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 17396 bytes
SHA-256: 4e4e282b48f956ae0678abcb08bbabb5e09e60233622269d5bc75a3af974feb3
font_02_sfnt_off00011978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11978 10404 bytes
SHA-256: b0cb7aa282c6266af976a85d7405bbd39cfa617f4105dd25cbdf2ce842e376ce

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