Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46a22f10e63ff3e…

MALICIOUS

PDF

66.2 KB Created: 2020-11-27 08:50:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ef9e528720414cf8c7a7c0beeb5fe656 SHA-1: 59903861ce2ece1970b0fdabca6254bd9fcec921 SHA-256: c46a22f10e63ff3e4605f2c06b267fdd206c549e91b43554dce960b5924dfd73
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/123?utm_term=dropping+the+atomic+bomb+worksheet PDF link annotation
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/nivivojesezop.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/2091873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f8738c791990.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/0efcee8cc6dc2.pdfIn PDF document text
    • https://murudogukezopo.weebly.com/uploads/1/3/4/3/134320821/ligurot-tibusafilosuru-dewuxiditesuna.pdfIn PDF document text
    • https://kelobutino.weebly.com/uploads/1/3/0/9/130969458/a0cb48.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/7e7fb4a8-7a14-44b6-a2c9-eb11af290300/51515141866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ba3e555-a904-4f32-9e0b-36e32055a883/36041811085.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/49143670220.pdfIn PDF document text
    • https://s3.amazonaws.com/liwelu/97491981383.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_off0000c549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC549 5608 bytes
SHA-256: d02ff3cc82ebe48d55a97d9f187f040d3e490b89a15d05a67e7d3bfbec31b801
font_01_sfnt_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 10548 bytes
SHA-256: c4a1dab353e32c704fd441c9456d79945ceb2d6b5fdef8f18b7d13522f1b7483

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