Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f05f035420c73b…

MALICIOUS

PDF

76.1 KB Created: 2020-11-21 02:20:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 926eccd579f0e8e01b5a94b09f059454 SHA-1: 2dc286554dfcf725693674f822c190307589d8d8 SHA-256: d2f05f035420c73bee60b31707ca94401b623b8f0fe37c0c903e418bf8de73ab
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=in+fiction+use+of+conventions+leads+to In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403120/normal_5fa463b36aa7d.pdfIn PDF document text
    • https://rawutakoze.weebly.com/uploads/1/3/4/3/134326806/midaxanubujupaj-rufizebatuveze-litipuxutero-nunezox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418379/normal_5fa57df1e9637.pdfIn PDF document text
    • https://mapuxotegudu.weebly.com/uploads/1/3/4/3/134356271/5559870.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/nemulexix.pdfIn PDF document text
    • https://logekififej.weebly.com/uploads/1/3/4/5/134502341/43f7bf38f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383314/normal_5f8bdbc023d5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/domipobowatubux.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/cv_uk_format_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/horde_leveling_guide_vanilla_wow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e019b466-5076-4601-b99a-afbf55977d62/24160471811.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/tobijalegusiw.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/fipuruz.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/arch_linux_old_packages.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE1 2900 bytes
SHA-256: 68d094faf81d2ea9f62e68ee4e789e40b6192f27e323b9e50c58fbaa8f881837
font_01_sfnt_off0000ea24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA24 4916 bytes
SHA-256: 545b0ad5592a9926066906051b0b46ad9b52e3bf49c0e6330731c9cdfbacfc4e
font_02_sfnt_off0000fafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFA 11736 bytes
SHA-256: 440290a4ae0d29b7469acddbb2b4915d427ee88507756a37e204718071bb42aa

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