Malicious PDF — malware analysis report

Static analysis result for SHA-256 a013dadb0ac9adc8…

MALICIOUS

PDF

72.0 KB Created: 2020-11-14 01:31:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: cc788803a7934f4998495736d8f1453e SHA-1: 16d1d386a74a88643eb840e9bb3569ae193c3549 SHA-256: a013dadb0ac9adc874b3e6f291b0a53abe20f438ec4e3ae481f70756cb0aa328
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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=jurnalul+fericirii+nicolae+steinhardt+rezumat In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419415/normal_5fa146987e922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370072/normal_5f9a608b68ad5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370074/normal_5f8aa50683e15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413866/normal_5fa48a8f61610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_5f99c07b7c17c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f872104680f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409614/normal_5f975172e3ef9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f87548a41d12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494160/normal_5fab803890fb9.pdfIn PDF document text
    • https://gosedizomomusuw.weebly.com/uploads/1/3/4/3/134313056/7c033.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://s3.amazonaws.com/nawuvud/sugoworifajelorirarosesez.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_off0000cd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD48 5180 bytes
SHA-256: 0c189b572ec3bd95c1bf83023638200d5708ec11dad5f6cc943b47da82ae6706
font_01_sfnt_off0000deb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB8 11768 bytes
SHA-256: 1bbc1d31ca724b4267bb383c5789b5a1df922d9ee5e80a25482447cbbd7501af
font_02_sfnt_off0001029b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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