Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fd2a211537ebb5…

MALICIOUS

PDF

82.0 KB Created: 2021-01-02 16:28:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2e585354f253a564e6bd0679f151c6a4 SHA-1: 7fe072cb82e2bdc4c437fd233c3e203e8c11f7eb SHA-256: b6fd2a211537ebb5cb5c2e690475d689ca5943273b8ac5402fec0a5f08d7fbd1
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The presence of a large link farm suggests an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, indicating it is likely a phishing or malware distribution document.

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://cctraff.ru/123?utm_term=nba+live+2004+cheats In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403685/normal_5fd977bc39ecd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423171/normal_5f9994cc49df9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411932/normal_5fb533ee51c3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_5fb540551eec9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370074/normal_5f896ba86e6b8.pdfIn PDF document text
    • https://rusekawavupor.weebly.com/uploads/1/3/4/0/134096427/favefaxijega.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460975/normal_5fca065e78f4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415327/normal_5fd14adff247f.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/nefunupu/93709171718.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/ninja_platformer_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/free_user_manual_for_kindle_fire_10.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/auditing_for_dummies_free.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/free_pandora_app_download_for_kindle.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/65144906499.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/dceu_val_zod.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_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 4896 bytes
SHA-256: 0bbdb95ad1705cd9e2e1153673d9b1e9e2e93d20247ff1bb592e57d4e7a0284a
font_01_sfnt_off0001080a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080A 10820 bytes
SHA-256: a5b3793cd495e45ba0fcc162197d6dcad12d810f1d8afe3021b0bdbdff02a917
font_02_sfnt_off00012cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEE 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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