Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d467ec109ef7458…

MALICIOUS

PDF

68.3 KB Created: 2021-09-12 16:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 854080a6094d6fc3041b460b3a49dd8d SHA-1: 37db2b5ad491ff0ba02a537fc5be90a762410ace SHA-256: 7d467ec109ef7458e32a206509fac765a4ebc316c097051fc5f1cc51b58b1ff4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristic 'PDF_IMAGE_LURE' indicates it uses an image-based approach with a clickable action, likely directing users to one of the numerous embedded URLs. The document's structure and the presence of many distinct hosts suggest a link farm designed to distribute malicious content or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://laborke.ru/uplcv?utm_term=freaky+sms+apk PDF link annotation
    • http://swapnakoodu.com/fck_uploads/file/45582315918.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/suwewazofulane.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/wifovu.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/63654942284.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///72653656577.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/jijebupimuwival.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/32413723026.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/bejamar.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/sevewat.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316aea6a3dc---98122750414.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/73302073814.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/gesefabefovidenaw.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/zijemorisedixinimisu.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/libawunozabudamepi.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109030251299931.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/pofamodobomubevuletuvizoz.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/14532323086.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/bobomojibixilus.pdfIn PDF document text
    • http://freeorden.com/media/file/gejunemuxididoxovore.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/wifofupinevazojoliso.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/zepofog.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nidodi.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/34528105345.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/gizawisitupiru.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_off0000aff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80A 14184 bytes
SHA-256: 49e34c790186e02dbb6aeb42c58e5605b53c3bab1ece4c66756692662c5644bd
font_02_sfnt_off0000eb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2B 10136 bytes
SHA-256: f06ec026f146e37e87acb6fc1e0a313d30b6f82d02a5cba641f16ee9b11720cd