Malicious PDF — malware analysis report

Static analysis result for SHA-256 338ca7616c8869cb…

MALICIOUS

PDF

69.2 KB Created: 2020-11-23 12:18:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 57b3692885a23d51bbc80ba699666a5e SHA-1: c0287d4f0608e7fa1a09f4273af0a5ab40fbfdd3 SHA-256: 338ca7616c8869cba6b90fc74e260476a05efaed1dd0146e255e82dffabb2bd2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO manipulation tactic. The embedded URLs are likely used to redirect users to malicious sites or phishing pages.

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://traffset.ru/strik?utm_term=lenovo+tab+4+7+inch+review PDF link annotation
    • https://rujuzodojavumip.weebly.com/uploads/1/3/4/7/134726220/9949328.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370302/normal_5f8ff04397905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_5fa67feb76d9b.pdfIn PDF document text
    • https://tebumozokafu.weebly.com/uploads/1/3/4/4/134471783/4b598c6c7be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403263/normal_5f93dab84b4b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410432/normal_5f9354bc678db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463551/normal_5fb5d574e679e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387918/normal_5f8dec69a10e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417408/normal_5fa702b819abb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374199/normal_5f93d002df950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_5f9081ec97b2c.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/46250cbc-bd35-485e-9842-41a864d7cf7c/serial_brain_2_youtube_most_recent_videos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33128b39-94bc-4a90-8f8a-960a36ef0e69/gironda_8x8_3_day_split.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aa628f2-b4fb-4596-8cab-37b5ffa1761a/romakebomifediga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16ee193c-aaab-4d97-9d64-63732c86bc40/hay_day_hack_without_survey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d215f24-afdf-4e74-a3b3-9fff2fa6abac/33304157812.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_off0000d3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AB 5076 bytes
SHA-256: 66ba60064e4032e90f62d6417010b56a7c49638df1ab2a8bb3743eb910ddf1e5
font_01_sfnt_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 10388 bytes
SHA-256: 32c098feb44838ccac79195152cc9e7a5e5ad8f871046d7a76c5686e121586e9

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