Malicious PDF — malware analysis report

Static analysis result for SHA-256 396d24561fb09cfe…

MALICIOUS

PDF

68.0 KB Created: 2020-11-11 22:00:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ada339df5a13ebaf33681bc4a6efc24c SHA-1: 1c5d5fd3254988a59dc0733091f0f318aa83e931 SHA-256: 396d24561fb09cfee784c807d7b0f5222027384910a463326a73e8c580a81043
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution mechanism. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to 'Personality assessment inventory' and 'wkhtmltopdf', indicating a lure to disguise the malicious intent. The presence of embedded URLs further supports the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafffi.ru/123?utm_term=personality+assessment+inventory PDF link annotation
    • https://mutimerujufidi.weebly.com/uploads/1/3/4/5/134526942/566921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f86f858a1f16.pdfIn PDF document text
    • https://mivijupa.weebly.com/uploads/1/3/4/5/134578330/b13a1bd.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/zuwodisukubepoxeguw.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/vupagepotite.pdfIn PDF document text
    • https://kipuxemoxux.weebly.com/uploads/1/3/4/6/134616309/rewofanedi.pdfIn PDF document text
    • https://jimigafekalese.weebly.com/uploads/1/3/1/4/131407537/dibimobotipibixo.pdfIn PDF document text
    • https://wiwawuvagowe.weebly.com/uploads/1/3/4/4/134496439/nuvuxutoxoxaka.pdfIn PDF document text
    • https://toxekemugig.weebly.com/uploads/1/3/4/4/134484635/4469811.pdfIn PDF document text
    • https://gijepeparo.weebly.com/uploads/1/3/4/3/134318767/benoj.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/5b9fb2c9.pdfIn PDF document text
    • https://mepetimis.weebly.com/uploads/1/3/1/4/131483418/4460890.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/wonoti/junisufidusesezanifizeje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8340c684-20e5-43c0-94b8-032e283a082d/lezaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/jvc_700x_digital_video_camera_manual.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_off0000cd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7E 4992 bytes
SHA-256: d05b98c30110a3fbda8d07f6a2e93bc2e047bb9477b67a0b021d1614de776d42
font_01_sfnt_off0000de6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6C 10808 bytes
SHA-256: d11435cbca1e4d4677def7ace5c72413fa2ed27bc6095523a0fc49f262f7c5c1

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