Malicious PDF — malware analysis report

Static analysis result for SHA-256 252db5ee7ee30004…

MALICIOUS

PDF

70.0 KB Created: 2020-12-01 02:52:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6af5e003ce1f985394ec2e2ebb17898d SHA-1: 100636ef44f20a3690d32b2e5c0aed4d75ee8113 SHA-256: 252db5ee7ee3000424a9388271c69bcfcae1ef3a54787daa40bb70880fdd743a
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are likely part of a link farm designed to direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to Excel functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=hyperlink+to+another+sheet+in+excel+2007
    • https://cdn-cms.f-static.net/uploads/4427295/normal_5faf02554b16c.pdf
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/6902567.pdf
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/6916756.pdf
    • https://cdn-cms.f-static.net/uploads/4374366/normal_5fb7193e2b69e.pdf
    • https://rogusedi.weebly.com/uploads/1/3/4/4/134433103/moberaju_salomawep_xesetunubokola_tujor.pdf
    • https://cdn-cms.f-static.net/uploads/4372086/normal_5f88710965275.pdf
    • https://cdn-cms.f-static.net/uploads/4480162/normal_5fa8203a33dd0.pdf
    • https://tixaradizu.weebly.com/uploads/1/3/4/6/134652762/1ecee0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wokesabisevo/zepixipabuw.pdf
    • https://static1.squarespace.com/static/5fc2be63405d5340f3359679/t/5fc56ccebc819f1cf48fdcec/1606773968950/62936347840.pdf
    • https://static1.squarespace.com/static/5fc0e2740a2757459be2c9b8/t/5fc11c967acac6192ae869b6/1606491286578/44048839121.pdf
    • https://s3.amazonaws.com/mujesogi/year_3_maths_sheets_to_print.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2b1.bin
d09ff78591489eb479ab48eba8b4a09153109503def5a72b0569fc3b953cd275
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B1 5568 bytes
font_01_sfnt_off0000e5ab.bin
362dc501a0f28d34c45db6df32c25f7bdcf21f4ce177f351ffe05bab0331ca0d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AB 11012 bytes