Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d0222c57c62cf6a…

MALICIOUS

PDF

78.3 KB Created: 2021-03-19 17:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 270f84c3b5880cf1249b27f63b8d7c6c SHA-1: db439d126e19b1d2cd5f5f14e632aef92d6259ce SHA-256: 0d0222c57c62cf6a53dbdf315b5179387ad139dc4062e44ed25386a3177b8e0e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious content. The primary lure appears to be a fake service for collating PDFs for free, hosted at 'dugedepap.ru'. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to trick users into downloading further malicious payloads, likely disguised as PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dugedepap.ru/wix?keyword=collate+pdfs+free PDF link annotation
    • https://mifesala.weebly.com/uploads/1/3/2/6/132683173/miretobewudezo.pdfIn PDF document text
    • https://duditoza.weebly.com/uploads/1/3/2/3/132302736/vogozivaw.pdfIn PDF document text
    • https://watogovujun.weebly.com/uploads/1/3/4/6/134626060/4369799.pdfIn PDF document text
    • https://norasavunoga.weebly.com/uploads/1/3/0/8/130874384/keperoninunipew_fixifiviwe_milemivivux_salel.pdfIn PDF document text
    • https://vosifiteke.weebly.com/uploads/1/3/6/0/136049758/genejinude-somip-gepelat-lisawotov.pdfIn PDF document text
    • https://kupejuzog.weebly.com/uploads/1/3/1/6/131637034/boforejime-vebewovifofa-gekavanutolopap.pdfIn PDF document text
    • https://gokatejasefe.weebly.com/uploads/1/3/4/6/134650338/98759f61e.pdfIn PDF document text
    • https://xoniwolujejusun.weebly.com/uploads/1/3/4/4/134456196/jujibefaxudumut.pdfIn PDF document text
    • https://beburasitowetu.weebly.com/uploads/1/3/0/9/130969608/sitisoj-sojejar-zezerag.pdfIn PDF document text
    • https://zivotawab.weebly.com/uploads/1/3/4/5/134576919/3f4d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_0656ec1ca9d74c2693d0c93c15eb7fb2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wolina/gopinaligixuj.pdfIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_4e1bd38332ab44cd9f99dcaad5f03bf4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/73606918050.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/autocad_command_prompt_missing.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/91461897591.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/81300567916.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/21830953879.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/psp_emulator_android_gold.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/62753517375.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 4940 bytes
SHA-256: cd271f818c5225a30b19a7715d910c84470dd9587f1a4e0d194f404228177943
font_01_sfnt_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 12828 bytes
SHA-256: f26dd5ab1d76c46f5cc3070a1108262e619fd8e6cdd13990563b01863ec80d66