Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff6e62e5951d5f0…

MALICIOUS

PDF

60.7 KB Created: 2020-11-22 18:48:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 0790fdc1f79c8a3286a0177fcde4ed91 SHA-1: 5e59bab925c40c1f3f7fb36a007353caef42b2f5 SHA-256: 5ff6e62e5951d5f0d397491eb4ab0181469725d46bbc5619793dcdce00253a56
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/aws?utm_term=bcbs+federal+provider+inquiry+form PDF link annotation
    • https://rizumamor.weebly.com/uploads/1/3/4/3/134395934/4737903.pdfIn PDF document text
    • https://buritovetozew.weebly.com/uploads/1/3/4/4/134486370/vobakasezofole_pulosuzavex.pdfIn PDF document text
    • https://xovozenoz.weebly.com/uploads/1/3/4/3/134348708/8f6d8dc14ecf.pdfIn PDF document text
    • https://dajurejew.weebly.com/uploads/1/3/4/7/134753869/4f6a1d.pdfIn PDF document text
    • https://wutiboduselojo.weebly.com/uploads/1/3/4/6/134665342/nogamogelat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405903/normal_5f99049a38203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371808/normal_5f93fa8fca793.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462037/normal_5fb3598f33f4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5fb7fb20d1d42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460680/normal_5fa333e0a1f08.pdfIn PDF document text
    • https://xukanodipu.weebly.com/uploads/1/3/4/8/134885825/tuviloralagosowugoj.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/344109dfcecc78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_5f8dfefe5c2e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387417/normal_5f90c8bf53beb.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/nawosineromigi/fast_paced_games_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/wuzukalarared.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_off0000b02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02B 5776 bytes
SHA-256: 668a71f65e82220433b39f6ed83a000d96a49dffafd0148048d14573b9c6848a
font_01_sfnt_off0000c3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C7 10068 bytes
SHA-256: 9ad16e8babdbac7ed5777fa59cecd097d2d57165be067d878aded8cfbf267656

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