Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed668f83c13b5457…

MALICIOUS

PDF

63.5 KB Created: 2020-12-29 14:47:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b7f72119c529e8e9877be1767e02264e SHA-1: bc063c9e645af2fd670eab2f0297ff5f48b88846 SHA-256: ed668f83c13b5457f923ea3fd5619e61d19665b907f1764503de8827d9c0c4aa
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to downloads and links. The embedded URLs form a link farm, with at least one URL pointing to known malicious infrastructure, suggesting an attempt to redirect users to phishing or malware sites. No scripts were extracted from this sample.

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://gettraff.ru/strik?utm_term=mor+sansar+ma+status+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4501356/normal_5fade944a6674.pdfIn PDF document text
    • https://dezojase.weebly.com/uploads/1/3/4/7/134711134/274157.pdfIn PDF document text
    • https://fojexoduzasob.weebly.com/uploads/1/3/4/6/134693365/lubibovulaxuxow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377377/normal_5fe6f2414d27e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_5fe8540edf06e.pdfIn PDF document text
    • https://tudaluvakagovax.weebly.com/uploads/1/3/4/6/134614365/digexewijiwekoze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427103/normal_5fbbb4cdd96dd.pdfIn PDF document text
    • https://dibozavo.weebly.com/uploads/1/3/4/5/134501923/xejufurifa_losevotajok_fawirepo_tudupugimuwafex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385647/normal_5fc33bc517250.pdfIn PDF document text
    • https://wofigazidiw.weebly.com/uploads/1/3/1/4/131437722/ferexaxalemevoku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/37ea2445-7d8e-4b5d-87e6-5b1b73213332/6467326454.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/64015962724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb91ab86-80c5-49b4-81b4-23a7796a66b6/40414356224.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA9 5068 bytes
SHA-256: d164fbce99405f117efacf6c9f6d36672b0278ffbdf3e158fc420cb799f250e7
font_01_sfnt_off0000cee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE4 10008 bytes
SHA-256: 81929c5cb296a9ad5ac5141f11a990421369bec835950cb1f6459bf73ee106eb

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