Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9ba9d9bedc1cf3…

MALICIOUS

PDF

74.3 KB Created: 2021-01-23 18:37:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6b70939fe9f8e2e5464d56472c9754df SHA-1: 914eeac319cecbbc68c4eb316061dab6d5f73bd3 SHA-256: 3b9ba9d9bedc1cf374aac3127352bf358fe1b962c45e5320767914a0318776f1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning or redirecting users to malicious sites. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, and one of the primary URLs points to a domain associated with malicious activity. Although no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest a malicious intent, likely related to phishing or malware delivery.

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=community+service+certificate+template+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407747/normal_5fde241e12e2b.pdfIn PDF document text
    • https://paguzijap.weebly.com/uploads/1/3/1/4/131453408/debafusowus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392220/normal_6001cf3064966.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500447/normal_5ff7773825485.pdfIn PDF document text
    • https://vonenefanor.weebly.com/uploads/1/3/4/6/134638091/5578697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468554/normal_5fd6805ded74b.pdfIn PDF document text
    • https://gisixumaxen.weebly.com/uploads/1/3/1/8/131856636/watumonevu.pdfIn PDF document text
    • https://fobepomakiroka.weebly.com/uploads/1/3/0/8/130874330/sodularurejenegenuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370057/normal_5fe4703a6b6ed.pdfIn PDF document text
    • https://wobipogipexiwom.weebly.com/uploads/1/3/1/0/131070125/jijifeguf_ripesa_boluf_xidukoluma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375885/normal_5fdcb5fa95b06.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/likerajatob/performance_cabretta_golf_glove.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/tarekuzelupufatip.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_off0000e709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE709 5368 bytes
SHA-256: 03d6163555c4eb47f882821d0cb00c2b597682a5ffeb8b9cd68e627e7a56d75a
font_01_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 10104 bytes
SHA-256: e88db14b924a276dd0ddf9ccfd8fd8dafcebcb1d4d83f23ef975f8e0d29ebd3b

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