Malicious PDF — malware analysis report

Static analysis result for SHA-256 8327b4a803be3f32…

MALICIOUS

PDF

70.1 KB Created: 2021-01-15 01:23:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0b2058e21cc6f3e787a56eb60caed62a SHA-1: 75f9c27c7fae31c2e07a74768f0c9d6cf21487a5 SHA-256: 8327b4a803be3f323814a80ef88b762da1ecaf268993ad0d712053dc4efc46df
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt, disguised with content related to a 'Kenmore 70 series dryer troubleshooting guide'. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate that the primary function is to redirect users to malicious or spam content hosted on external sites.

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://trafficel.ru/aws?utm_term=kenmore+70+series+dryer+troubleshooting+guide PDF link annotation
    • https://cdn.sqhk.co/xasomegupur/hfsP9hi/194341393.pdfIn PDF document text
    • https://fewarixavaj.weebly.com/uploads/1/3/4/8/134847043/6506477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419640/normal_5f9bb1a3b7497.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493541/normal_5fc86eae4d81e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374984/normal_5ffe5a975b2ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410703/normal_5f932bfa38111.pdfIn PDF document text
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/tunotajakawuw-nipumosixuxeno-xopugigo.pdfIn PDF document text
    • https://sisekiki.weebly.com/uploads/1/3/4/6/134622657/f7c53.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/ZZjjhiK/19461824167.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447497/normal_5fcacbedc23b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503584/normal_5fb5b8c5d5129.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386591/normal_5fe383dd83665.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/tenunud/1440415249.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/heavy_duty_stapler_300_sheet_capacity.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_off0000d3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D4 5460 bytes
SHA-256: 0e655adb1754cae4be8923e98750bdf5c204c1b7d5a68050bebcd1db2d3f99af
font_01_sfnt_off0000e64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64C 10804 bytes
SHA-256: 0a9ef7548359fd8f38a4b10bfa039dd5fbf3c8a0169a720184cb51fb83827e20

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