Malicious PDF — malware analysis report

Static analysis result for SHA-256 4068f2a866507acc…

MALICIOUS

PDF

76.3 KB Created: 2021-01-08 18:50:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: eb47e05c70db460583457b593948a27d SHA-1: b9dcb5a35a3b50cde74e3e997352d793f42da7a9 SHA-256: 4068f2a866507accd2eb4e0b6454219e2712c10f12044599ffd00b8af1ae1a9e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous unknown reputation URLs strongly indicate a malicious intent to direct users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffking.ru/123?utm_term=free+dsn+schematic+viewer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418401/normal_5f9ebd2e1df55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404739/normal_5fede67f750c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494166/normal_5fae2cdf59953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410018/normal_5fac04f19e1b0.pdfIn PDF document text
    • https://vepawedisekonok.weebly.com/uploads/1/3/4/9/134900222/8759d52e.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/9406023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424666/normal_5fd1fe8c56ee1.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/14e1c52614790c.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/wukevirenesu/3154007583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7ff5b7d-fd05-49bb-b10f-84dab02985b7/story_elements_graphic_organizer_1st.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1739a71-7cc2-4d68-a2ac-1d57c1498920/new_ulm_high_school.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 7

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_off0000e920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE920 5252 bytes
SHA-256: d9fe52b4c5f28cb9de7df0f45fb4cf400affbcd929236309179c1a392d0b1a58
font_01_sfnt_off0000fae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE3 12216 bytes
SHA-256: a1f1820bc24347b3f3396e9a066ba9474fe118a404c56c678bb31c23260610d1

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