Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a98edde81461be4…

MALICIOUS

PDF

73.9 KB Created: 2021-04-21 02:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 10a7f6484ae9974e35d6ad115fa464e2 SHA-1: cab9aa14514f3ff579c9b4c76219f9183caf161d SHA-256: 2a98edde81461be4baa15378934a1d6c5d18ffb94720fcb223f00d49a002f4eb
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains a large number of embedded links, many of which point to known malicious redirector infrastructure or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the embedded links suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://dafemum.ru/strik?utm_term=2003+kenworth+t800+owners+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_604867890e1ea.pdfIn PDF document text
    • http://popularchoice.space/free_boost_mobile_reboost_pin_numberd9t45.pdfIn PDF document text
    • https://toledopo.weebly.com/uploads/1/3/4/5/134596352/ae14253d4d1fd.pdfIn PDF document text
    • https://bukodagunotul.weebly.com/uploads/1/3/4/0/134012399/4575219.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495536/normal_5fdebb8d28886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495855/normal_6023f19d7b775.pdfIn PDF document text
    • https://bogevojozoluki.weebly.com/uploads/1/3/4/7/134708627/vuwitopagede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489255/normal_5fd7d12f298c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414680/normal_6065f7900f1a3.pdfIn PDF document text
    • http://trydouche.xyz/118541106359a9au.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://uploads.strikinglycdn.com/files/00f4dc5d-8a2a-48a4-88f4-ec716148bf4f/pagugewapediresazijugog.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/what_kid_snacks_are_gluten_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/how_to_play_guitar_in_open_g.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e832152a-1d3d-4125-bac8-34d8f1382617/juxuzanad.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/derepi.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_off0000d589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD589 5452 bytes
SHA-256: 5cba8be03daffcab8ef2781a557a6e6017dd6cc7fcd6952fb7e1c52b6ac5da05
font_01_sfnt_off0000e7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EB 10768 bytes
SHA-256: 6664ee3cf1fc3c746ddb1ebb90f03d92c7e8dae2e87d3fa684bd76fa97cc6676
font_02_sfnt_off00010cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD1 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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