Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8d6d9376ee5959…

MALICIOUS

PDF

76.2 KB Created: 2020-12-27 01:05:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e31dbc010bd81d5b90e73768c5299e05 SHA-1: 95abb2b0742868b1641cdbe3dbaa625d2fd5db03 SHA-256: aa8d6d9376ee595970c64914c1c7d29fc6695e09d967cde788375d4716fc31a6
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/strik?utm_term=word+connect+app+cash+out In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369494/normal_5f89fe40f13a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375525/normal_5fc4d9f20d378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471238/normal_5fb81f473e7a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502500/normal_5fc37fc6dff77.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/hacGTZf/61814509746.pdfIn PDF document text
    • https://cdn.sqhk.co/vojogalu/rZshcct/honda_gx240_engine_for_sale_uk.pdfIn PDF document text
    • https://ladolijid.weebly.com/uploads/1/3/2/8/132816107/5153959.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/1hdUhjM/jogak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384464/normal_5fd7a8a04c80d.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/fuwuzerijofa/civ_6_beginner_guide_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/26001846750.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/the_world_on_the_turtles_back_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/limping_child_guideline.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/beer_brewing_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/ap_budget_2018-_19.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/centrale_sans_pro_bold_font_free.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_off0000e59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 5140 bytes
SHA-256: 5bf121b193c188d6960e51f7921795a322a5005d334745e1029d32b18f4e6c7f
font_01_sfnt_off0000f717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000ffa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 10456 bytes
SHA-256: 60cc3811de7346d7897bdceed013a5e40fea71fe35d88495aa855f119706d8cf

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