Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f3662cdadf781f…

MALICIOUS

PDF

98.7 KB Created: 2021-01-17 13:36:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d57b20aefdbf351d79c55fcc0bc03ea6 SHA-1: 98281f2a372c19028fdf1f836727ffe5f295a8a0 SHA-256: e6f3662cdadf781fc3072e786ee399809da07cd1ffc47b76cd336b1593472523
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://trafffe.ru/aws?utm_term=abstract+algebra+judson+solutions+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4428061/normal_5ffa791f4ee99.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/hhgfih4/score_hero_fase_207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371808/normal_5f8c07ff0c677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374521/normal_5f9ac3efec960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_5f91914c59a85.pdfIn PDF document text
    • https://site-1174179.mozfiles.com/files/1174179/aura_kingdom_mobile.pdfIn PDF document text
    • https://site-1178522.mozfiles.com/files/1178522/rupotogalawodafug.pdfIn PDF document text
    • https://site-1211537.mozfiles.com/files/1211537/16778583649.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423471/normal_5fcab4b974dcb.pdfIn PDF document text
    • https://site-1174730.mozfiles.com/files/1174730/52164514472.pdfIn PDF document text
    • https://site-1168092.mozfiles.com/files/1168092/vudexeza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478923/normal_5fadca88f0c5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479235/normal_5fc7fa87ac73d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501356/normal_5fe055f52e1d4.pdfIn PDF document text
    • https://site-1180586.mozfiles.com/files/1180586/how_to_get_contacts_for_cheaper.pdfIn PDF document text
    • https://site-1206062.mozfiles.com/files/1206062/56207960362.pdfIn PDF document text
    • https://site-1168324.mozfiles.com/files/1168324/78617993972.pdfIn PDF document text
    • https://site-1177757.mozfiles.com/files/1177757/rakeg.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C4 14076 bytes
SHA-256: 004e8c3a7ac768a01f2e921634d94beffd2b629ced4faaa4041470f763ca0bac
font_01_sfnt_off000142b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B8 5464 bytes
SHA-256: 0c98f602598541d6e6699fd5b9434be370ab96ecee7215c25f40c1bd880538b0
font_02_sfnt_off00015538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15538 11700 bytes
SHA-256: 700b6ef3a7eacdf62944d701f0de53939c827114bd5c9c0c30cc2f32baea3542

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