Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5b1821c4023f4e…

MALICIOUS

PDF

82.2 KB Created: 2021-01-06 08:36:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 60b971bc55f50f64d38a6747701ef818 SHA-1: 003e38fb31d6564e10b17a7f18da4aa82dbd5545 SHA-256: cc5b1821c4023f4ef9716b7ace93aabf01cd47b28a66cbedb16d967fed77ee7c
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many pointing to disposable domains, and is described as a link farm. The presence of external URIs and the nature of the content suggest it is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/aws?utm_term=rom+android+9+para+j7+prime PDF link annotation
    • https://kuguzozivef.weebly.com/uploads/1/3/0/7/130739994/purotilimed-bugiperenow.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxevabuvix/gf9heVS/fezejumoj.pdfIn PDF document text
    • https://zujetopefij.weebly.com/uploads/1/3/4/7/134766602/rulekesateba.pdfIn PDF document text
    • https://sakafafemowuva.weebly.com/uploads/1/3/4/6/134694971/30b102cc98a.pdfIn PDF document text
    • https://cdn.sqhk.co/divekezor/hdgdyGr/6561201261.pdfIn PDF document text
    • https://dodoluwateja.weebly.com/uploads/1/3/1/3/131381806/4788359.pdfIn PDF document text
    • https://cdn.sqhk.co/zaperarori/W3thcXM/xalasodosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455387/normal_5fb686bfe2ede.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/zubamedeva_goxizijanawavu_kixabiwe_gapuluzar.pdfIn PDF document text
    • https://sisumojixidew.weebly.com/uploads/1/3/4/3/134355683/09da6ac7e4d0124.pdfIn PDF document text
    • https://wunogalabapa.weebly.com/uploads/1/3/4/6/134603674/edb71.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/745f7b17-a622-4c2f-9423-a7547cdd0943/85278594099.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 5216 bytes
SHA-256: 1fd8ca2fbac5e94840b374d7ec8a70ed42810acd8947b44f44aae0a827d3777c
font_01_sfnt_off000105bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BD 2484 bytes
SHA-256: 037452a70a3faa9c9baec1aec94e96d3e23c81c469aa12f7de31bc9e136b458b
font_02_sfnt_off0001109f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109F 14180 bytes
SHA-256: 60b0748fd547337df8293740fe562460a73423fb3263e530690346e092f94b00

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