Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2387b72a7f3fc3…

MALICIOUS

PDF

74.5 KB Created: 2021-01-08 05:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d193b1b71d19c9c0205238622657c7dd SHA-1: 79bb1154d582e91f7d41e797bb89dda0c877f4ea SHA-256: 7b2387b72a7f3fc3ac3417adc200fb0a56a509e1540ae0bcdd96f065b9de3084
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file exhibits characteristics of a malicious link farm, containing numerous external links, many pointing to disposable hosting services. The presence of a link to a known malicious redirector infrastructure and the overall structure strongly suggest an attempt to distribute malware or engage in phishing. While no scripts were directly extracted, the PDF's nature and the detected malicious links indicate a high likelihood of malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=couple+line+dance In PDF document text
    • https://laverikiwife.weebly.com/uploads/1/3/4/5/134502667/4004344.pdfIn PDF document text
    • https://cdn.sqhk.co/papedajapej/0hiiaji/1433808077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5fa11ad37e45e.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/jsji1ia/best_praise_and_worship_songs_2020_mp3_download.pdfIn PDF document text
    • https://jekomijijupuda.weebly.com/uploads/1/3/1/4/131438685/c7687b04c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382782/normal_5fbe94f472d27.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/5544981.pdfIn PDF document text
    • https://tifogufa.weebly.com/uploads/1/3/1/6/131637606/liluduzelitub_wepowavonilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_5fc12c301453f.pdfIn PDF document text
    • https://pabenegoje.weebly.com/uploads/1/3/4/3/134348732/379443f.pdfIn PDF document text
    • https://zasigusedorel.weebly.com/uploads/1/3/4/3/134386673/3306307.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 4700 bytes
SHA-256: bddc9f8599237b502a1de3a0c9756d4f940fbe88074150343c8bcb40ad67a2c3
font_01_sfnt_off0000f767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF767 11172 bytes
SHA-256: c15ee3a643b90a964fe6b2861c16000cd2ea2992bea32a8a0e1250b95dc0d376

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