Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd8d1575d5b0728…

MALICIOUS

PDF

78.1 KB Created: 2021-02-22 22:54:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 051cb95ea1710ea7bee5865fc12efd16 SHA-1: 39fe4c0681e10bc84f5c120c05c0a19838138fd6 SHA-256: 0fd8d1575d5b0728e0365243c52d9c9f3b7dbdbbe3b49b5c6e493c3345352236
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting or redirectors, indicating a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. While no scripts were extracted, the structure and link farm nature strongly suggest the PDF's purpose is to redirect users to harmful sites.

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://crophysi.ru/123?utm_term=how+to+control+behavior+problems+in+the+classroom In PDF document text
    • https://static.s123-cdn-static.com/uploads/4490918/normal_5fe5a299623b9.pdfIn PDF document text
    • https://rofujerejikuf.weebly.com/uploads/1/3/5/3/135388349/8137848.pdfIn PDF document text
    • https://fibukumaguwin.weebly.com/uploads/1/3/4/7/134770434/4884471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393754/normal_6012db3019b49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374698/normal_5fdd8bc65bc0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365536/normal_600514700f679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390637/normal_602454ce4e1ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479684/normal_600fb806d1cb7.pdfIn PDF document text
    • https://fovivijidilel.weebly.com/uploads/1/3/4/8/134888041/7807929.pdfIn PDF document text
    • https://zodemabu.weebly.com/uploads/1/3/4/8/134896511/zazigugavuluwaz.pdfIn PDF document text
    • http://iciapp.xyz/weekly_family_budget_template_exceldw471.pdfIn PDF document text
    • http://tipografiyav.moscow/godonigi3wvcc.pdfIn PDF document text
    • https://dadekubezaxinis.weebly.com/uploads/1/3/2/7/132740399/541229.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lakuxizutigevo.rf.gd/online_photo_editing_in_jpg_format.pdfIn PDF document text
    • http://dekifovep.epizy.com/gijawove.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 5424 bytes
SHA-256: 6faa01b5b67a6f6d72bf8d8983a80f9867be719135c919f8ebd5cc32477484c6
font_01_sfnt_off00010705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 10456 bytes
SHA-256: e99b510042900bca20d54634cc58ac2c5abdea74a217b9d87a1a871e28de47c5

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