Malicious PDF — malware analysis report

Static analysis result for SHA-256 31557c28880dc21c…

MALICIOUS

PDF

70.0 KB Created: 2020-12-20 13:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 759cb728cf0da2de2edb8336479339fa SHA-1: 962e9d8a39f764cb595e45032fac9ea32875b6f7 SHA-256: 31557c28880dc21c77092fbf7c0f7922d72f6a6a4d596426d1c311445ea7c609
244 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, identified as a link farm, with a critical heuristic firing for malicious redirector links. One such link points to 'traffmen.ru', a known malicious domain. The document body is heavily obfuscated, but the presence of embedded links and the heuristic firings strongly suggest a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

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://traffmen.ru/strik?utm_term=where+is+717+area+code+in+california In PDF document text
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/67c0ee88cd38bf.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/lodoxedaxobimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388046/normal_5f8f734b98f18.pdfIn PDF document text
    • https://zirenujunez.weebly.com/uploads/1/3/4/4/134431605/5929568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481994/normal_5fb3cd1841cc0.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/4391882.pdfIn PDF document text
    • https://xikoroto.weebly.com/uploads/1/3/4/3/134338579/zevajubifi_sojat_gegitamaf.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/3e3015bb-7c80-490b-810f-8fd6a7ce21b5/31669263602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e798797-3d93-44e2-90f9-9fde9da308fa/ketifogudetilelebexigaliw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4daea8787e879898531d2/t/5fc5c9d061e25426e100ad0b/1606797776630/animal_crossing_pocket_camp_happy_home_designer_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd748daf-d02e-450c-860d-54f4fecf5091/93010075366.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdecdfaf67c863bcd17ac41/t/5fdf14867514fb3b7653be07/1608455302732/23801550301.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD649 5256 bytes
SHA-256: f32299232af9e6d30394d017c8e6e289edd8636d1a04ee0040195e6efdf6e46b
font_01_sfnt_off0000e83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 10260 bytes
SHA-256: 651ac58086edb17d1763ea7fd22793f701c08191dc7d5e5f6faf61b428da5178

Open this report in the interactive analyzer, or submit your own file for analysis.