Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1d98f0d7559ac0…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 11:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4fa01e976e62e38f8c7692b4e48ad15d SHA-1: 656fb4e2e7d1a8a6e5810c3f09b46b18ef1cb7f1 SHA-256: 3a1d98f0d7559ac09dcbadf8e5ec3f1e9a508a5a6895b308d697b3959d44923c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a strong intent to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, highlighting the use of link farms on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=fantastic+mr+fox+roald+dahl+read+online PDF link annotation
    • https://badoza.net/userfiles/file/seset.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/31939191275.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/zagimapomi.pdfIn PDF document text
    • https://renault-service.com/userfiles/40942345467.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/99818018797.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/bavagenoboloxeboja.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/15335586550.pdfIn PDF document text
    • https://braus.uz/images/shared/file/8668781601.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/ladidewabibexuw.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/77331451248.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/wuduwaxinivudekoto.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/vuzigonexobe.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/25492535366.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/sezelewejokupegixefujavaz.pdfIn PDF document text
    • https://invision.buzyhub.com/files/meterurafosopigelir.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/14837694183.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/buzotuzafojosadovi.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/13721756566.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/66484940460.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xejizuv.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/vavidenajademunutavubimin.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/61964972218.pdfIn PDF document text
    • http://moretonassets.net/userfiles/vidinebeluz.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/21762504492.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/52054397317.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_off0000dab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB0 10820 bytes
SHA-256: f695c415e0474324f5cb31a8aeef614bbf7081a754a13af1e924506844a9d5d0
font_01_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 18024 bytes
SHA-256: b6d62a5ced80a698e9380f1f3fcc713cf39bda6f5328eb55f84c4f793114b196
font_02_sfnt_off0001226c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.