Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f31734564dbe8a…

MALICIOUS

PDF

78.4 KB Created: 2021-03-03 23:32:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 87ffea0a4f594b864b025bd943926998 SHA-1: a42681412db91e3cc0efc39bf1f39831add5c41d SHA-256: 74f31734564dbe8ad4208271516acc295fda9cce41dcb7d9a43e035c9e947aed
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though malformed, contains a plausible lure related to setting up a coffee maker, which is used to drive traffic to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/strik?utm_term=how+to+set+the+time+on+a+krups+savoy+coffee+maker PDF link annotation
    • https://xijeruwenuvu.weebly.com/uploads/1/3/4/0/134018409/9412701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403824/normal_6028ab27be458.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388833/normal_5fd076e1e0c51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426416/normal_5ff7822c34aa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420039/normal_603ee7dd60477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481515/normal_603f3f78894a2.pdfIn PDF document text
    • https://zomuguwiremadak.weebly.com/uploads/1/3/1/4/131406071/sikiwogado_felubumusudeva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491410/normal_603e93d834e9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462096/normal_602c4e865a5bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483103/normal_600ae7ac0751d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470540/normal_60170ad1d006d.pdfIn PDF document text
    • https://degebemug.weebly.com/uploads/1/3/0/8/130814630/9250909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455658/normal_5fe999bbbfa0a.pdfIn PDF document text
    • https://wewiruvikaju.weebly.com/uploads/1/3/0/7/130775929/talafutufoxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387421/normal_5ff768a833e86.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://damabop.epizy.com/noxusalepovovid.pdfIn PDF document text
    • http://jusaxokipumata.rf.gd/16152353457.pdfIn PDF document text
    • http://mosujala.rf.gd/padivogaparomoxuxejoti.pdfIn PDF document text
    • http://zorufuzelal.rf.gd/og_mandino_university_of_success_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/b_ed_form_date_2019_rajasthan_university.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_off0000f5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 5504 bytes
SHA-256: 7ad035f41a1c309881385b6dfa25edd4425bd0683bd43b56a64b0b796eb744d3
font_01_sfnt_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 10548 bytes
SHA-256: cdc16261439fedfc2e306125fbf4e4e60d223c5fcba7794fb2e8c54040e562ce

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