Malicious PDF — malware analysis report

Static analysis result for SHA-256 33aa19fb0477922c…

MALICIOUS

PDF

67.8 KB Created: 2021-01-13 17:55:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e684348959897261da93a802fa5ebc27 SHA-1: d7a907a910d25aa2d228ad3308c6a20121375dfe SHA-256: 33aa19fb0477922c0869f9c5f5a2e37bac5604da3c1b21ad78aef6a63caf557a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farming or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely as part of a broader phishing or malware distribution scheme.

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=classification%252F+taxonomy+powerpoint+notes+answers PDF link annotation
    • https://site-1174463.mozfiles.com/files/1174463/rogobaluwevegikopasiva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_5fb73423b8782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425514/normal_5f994f53543da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414174/normal_5fa6849e83c6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502721/normal_5fc9aa275d1b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_5f8e6526750f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452217/normal_5faf3ce224412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376096/normal_5fbee46b45bd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417536/normal_5fd8e3d23028b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483072/normal_5fe0d75d18442.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449769/normal_5fc71c6f05a8a.pdfIn PDF document text
    • https://site-1175422.mozfiles.com/files/1175422/spectacle_definition_in_film.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374979/normal_5f89de41c9a25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5f8edae834043.pdfIn PDF document text
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/nogolanik_rogugosujuto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC913 5364 bytes
SHA-256: 8df8bf4da2fec3f5e18fba2d5aa0bdca82572dd0734623cec398d5620c983211
font_01_sfnt_off0000db63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 11440 bytes
SHA-256: 1ac981695be35854037121f1eba984a0717da11d2b61ef705e417bfb8adcfc48

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