Malicious PDF — malware analysis report

Static analysis result for SHA-256 34211949827c35b1…

MALICIOUS

PDF

76.4 KB Created: 2021-05-23 19:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8cf2fcc1ec919f71f50c115b72f2d67c SHA-1: 317ef9d6fec182555d1cbd39bee04094fbf098d4 SHA-256: 34211949827c35b1dccfbba6a5eced636c399b9b5c98f13c8ebe814171c7967d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://xezojetit.ru/strik?utm_term=how+to+avoid+redundancy+at+work', is likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=how+to+avoid+redundancy+at+work PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481056/normal_5fec36863989f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459341/normal_6019c723dc609.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_60236980f2f15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450034/normal_5fe4d46d98cb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459477/normal_603a11b09e4cb.pdfIn PDF document text
    • https://rirakivu.weebly.com/uploads/1/3/5/3/135333056/9415376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481990/normal_60545b6d0d2e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_5fd622e139486.pdfIn PDF document text
    • https://kazenatujexisof.weebly.com/uploads/1/3/1/6/131637291/mumig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_5fd79e5f4eb25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411926/normal_600c933107745.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383579/normal_5ff19a46193c0.pdfIn PDF document text
    • https://bitugibetofovo.weebly.com/uploads/1/3/0/9/130969362/vovebivekejuf-tibasebigemirud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501509/normal_606d4187dbe48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413223/normal_5feb3b618868c.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/nokiva/how_to_play_final_fantasy_7.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/classroom_management_strategies_james_cangelosi.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/gogojif.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/12622747188.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/77395041547.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_off0000ee0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 5004 bytes
SHA-256: 2f46b95ac6551a8036cc51a1072c125ba8724d4b0597a7ebc5a81432abf4a794
font_01_sfnt_off0000ff39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF39 10320 bytes
SHA-256: 195da2cf106c7a442702f9b170ab0df79771d6443c2fe9ce72574a10c9b7d76f

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