Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6b7cd09b3d6109…

MALICIOUS

PDF

69.7 KB Created: 2020-12-04 23:37:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: af52878010d61dba7852f0ff146a9d7e SHA-1: 9f55c9148790e4ea78fa65b0f84a07093a3b3b74 SHA-256: 5a6b7cd09b3d61096272d724dfaa351cd761b77353a7f52b6f0838471c93c407
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one critical heuristic identifying it as a PDF link farm. One of the links, 'https://cctraff.ru/aws?utm_term=mens+chelsea+boots+style+guide', is flagged as a known malicious redirector. The ML classifier and ClamAV also strongly indicate maliciousness, suggesting the document is designed to redirect users to harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/aws?utm_term=mens+chelsea+boots+style+guide In PDF document text
    • https://xodasolilixodi.weebly.com/uploads/1/3/4/8/134874129/1606479.pdfIn PDF document text
    • https://wajodaxomunav.weebly.com/uploads/1/3/4/6/134625674/xifiromosokegotaw.pdfIn PDF document text
    • https://bujugerevik.weebly.com/uploads/1/3/4/6/134677448/3114840.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wefemabeni/chaahat_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/94702691566.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/ruxarop.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c3d560f2895dc1e72903/t/5fc111d6f3de5e49b58a441b/1606488534943/sekojigosogemiw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5da53485235c86bde238/1606376871383/information_technology_reviewer.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/21005056580.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/fantasy_ocean_names.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/s_words_to_describe_someone_with_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/65940036284.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_off0000c886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC886 5236 bytes
SHA-256: 744c9b4ea0a759db9227528ef39a5b2519f07f303d23d1494ac2aa422bb40cab
font_01_sfnt_off0000da51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 9860 bytes
SHA-256: 3d45bf77e2fa65fda089e1c87478eff49a5e418bfc11ae93eefff1dd5b769041
font_02_sfnt_off0000fc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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