Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf160f8a06f520fc…

MALICIOUS

PDF

86.0 KB Created: 2021-03-01 00:09:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2dd34832dd2eac135cdfc95b275e3499 SHA-1: 4ff9713b4fc342b1835e3edf77cbe219e194971e SHA-256: bf160f8a06f520fca720c681091ac500271b26f4bad54b0bfd51f3f0831dc678
94 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains a large number of external links, indicating a potential SEO link farm or a lure for malicious content. The heuristic 'PDF_SEO_LINK_FARM' specifically points to a mass of external PDF links, with the first identified URL being https://cdn.sqhk.co/romilononove/gfuAhbF/vinenejetejivu.pdf. The presence of embedded URLs and the overall structure suggest an attempt to direct users to potentially harmful external resources, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9475

Heuristics 3

  • 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
  • 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://jacksth.ru/award?keyword=african+wild+dogs+eat+human PDF link annotation
    • https://cdn.sqhk.co/romilononove/gfuAhbF/vinenejetejivu.pdfIn PDF document text
    • https://xolesozetenosox.weebly.com/uploads/1/3/1/0/131070434/24eafc5ed.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/9Auls3W/8262886258.pdfIn PDF document text
    • https://cdn.sqhk.co/zewumabigige/hd61T5v/27943198305.pdfIn PDF document text
    • https://zuzefeza.weebly.com/uploads/1/3/1/3/131397950/jivowuvuxiwazo.pdfIn PDF document text
    • https://cdn.sqhk.co/bifoligi/aADXjgp/41594818385.pdfIn PDF document text
    • https://cdn.sqhk.co/kogeledewafo/kLAhh7U/37902671004.pdfIn PDF document text
    • https://cdn.sqhk.co/zalivelo/aidtBch/vekupirif.pdfIn PDF document text
    • http://kobivoweder.mypressonline.com/manonoruzax.pdfIn PDF document text
    • https://cdn.sqhk.co/pixukinoma/bNm7Hjf/pewilagujepexaka.pdfIn PDF document text
    • https://cdn.sqhk.co/tememagitapo/WghhcBF/12448882110.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/wavelepejiperezalejul.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A40 5516 bytes
SHA-256: 6b522091db1959464ed14b4aa8f4aa74118af1e636a1cf3d3093d5fce288660a

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