Malicious PDF — malware analysis report

Static analysis result for SHA-256 7608e56a9ce28d54…

MALICIOUS

PDF

70.9 KB Created: 2021-02-06 07:13:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0b60f17ef0e32e3bae0153bada222d74 SHA-1: e6f8791390631d8424fe67b5390bc2270a3958ef SHA-256: 7608e56a9ce28d5439202bfce87932e1c037b8c66da42e4da3ea52b15e34f8b3
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links pointing to disposable domains and known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely leveraging embedded JavaScript for redirection.

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
  • 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 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://yafferge.ru/123?utm_term=dymo+rhino+5200+service+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481062/normal_601dde0d0941d.pdfIn PDF document text
    • https://bazunebusa.weebly.com/uploads/1/3/5/3/135397504/9741259.pdfIn PDF document text
    • https://nesexabaxurozij.weebly.com/uploads/1/3/4/8/134898102/tiwagulasevivujiga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445106/normal_5fec86190e7d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421640/normal_5fd919c524ff6.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/xupixuwefado_tivofox_rijonirubuk.pdfIn PDF document text
    • http://hrushch.space/99202749682i2b9o.pdfIn PDF document text
    • https://cdn.sqhk.co/nananava/gcjfOhb/58835238982.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408483/normal_5ffdb3f59717b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469370/normal_5fd2dcbc8ca8c.pdfIn PDF document text
    • https://samoderusewon.weebly.com/uploads/1/3/1/3/131383586/2977509.pdfIn PDF document text
    • http://mini-cam2.club/healing_crystals_the_az_guide_to_555d7yut.pdfIn PDF document text
    • http://tonerinkstore.com/zolemivut7717v.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/kulinisokakewi/agriculture_definitions.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/wadubev.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/sugeme.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/45259745302.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_off0000d72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 5600 bytes
SHA-256: fac67a9222a356dfa238db881ac5c9bec9c191f9d02a7f10703278603dba7ca6
font_01_sfnt_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 10748 bytes
SHA-256: b46e0f722c3f59e1532cc1f59b7fb6b2002810389e082d9cae1bb5e5b6f49317

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