Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd02d89ccd48bcac…

MALICIOUS

PDF

62.0 KB Created: 2021-01-01 08:26:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 98ef9df6ee105fc664d9fb8e4cd6e308 SHA-1: 0dd29ee56a677a420a7618cb128a07bab9538f3e SHA-256: cd02d89ccd48bcacde5af67cd330c873cb1765827a16d47b03e374a62e16ce4d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically flagged as a link farm on disposable hosting, suggesting a phishing or redirection attempt. The PDF structure and embedded content, though partially obfuscated, point towards an attempt to exploit users by directing them to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffine.ru/123?utm_term=taylor+scale+manual+7209 PDF link annotation
    • https://cdn.sqhk.co/masamiwe/ghiciac/ladybug_and_cat_noir_coloring_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/ghdVYEg/nomebivemanuwiz.pdfIn PDF document text
    • https://nofuzibid.weebly.com/uploads/1/3/1/4/131453406/fisirujupubupiba.pdfIn PDF document text
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/rebujiteg.pdfIn PDF document text
    • https://deponoma.weebly.com/uploads/1/3/2/6/132696267/jowimutusowexagum.pdfIn PDF document text
    • https://dujopoda.weebly.com/uploads/1/3/0/7/130739119/3038930.pdfIn PDF document text
    • https://manuxemewawi.weebly.com/uploads/1/3/4/4/134443751/088b4d2cdb.pdfIn PDF document text
    • https://nagigezivozitos.weebly.com/uploads/1/3/4/3/134340852/peropuxoxojododuvilo.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/fibV1uJ/wilderness_survival_guide_dnd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/83f22023-2c82-4608-929a-6e6ce2dbde9d/secret_of_mana_2018_soundtrack.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/donor_thank_you_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/dogilagegomidefodede.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/booter_website_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/97637155036.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_off0000b518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB518 5504 bytes
SHA-256: f3629129c5db95478bc7193e5b748b05a160d78870e402b234833d55539f90f8
font_01_sfnt_off0000c7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C5 10440 bytes
SHA-256: dac91951a9e3b2935b982526522279e5ee1506d642d5bfd982f433c8bf2f733e

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