Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a0dfa85e6580b5…

MALICIOUS

PDF

67.8 KB Created: 2020-11-25 08:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: dfe796a74d867f837d81ba6abf6618b4 SHA-1: b65f9936532bbed434cf439fb11e206a45b07913 SHA-256: 22a0dfa85e6580b57f74b1802448045d861d5eac5b04e060e88547d2518c083a
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting or known redirector infrastructure. The heuristic firings indicate that this PDF is designed as a link farm, likely to direct users to malicious or phishing websites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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://cctraff.ru/123?utm_term=memorias+de+una+geisha+pdf+libro In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376866/normal_5f8d84e8b0162.pdfIn PDF document text
    • https://tudidufagul.weebly.com/uploads/1/3/4/6/134622529/gikukubutot.pdfIn PDF document text
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/jepigupivewezi_mikurorefajexi_ruzesenazoxasa.pdfIn PDF document text
    • https://kagapefox.weebly.com/uploads/1/3/4/8/134846757/7055945.pdfIn PDF document text
    • https://nebikaxo.weebly.com/uploads/1/3/4/6/134655772/326fcf.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/vifotatilaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_5f9c989c9d098.pdfIn PDF document text
    • https://pifejidulilev.weebly.com/uploads/1/3/4/4/134480865/c6a685d36456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5fac52f5a8077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403127/normal_5fb7051746743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_5f919b152df9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cecb7e8-7303-429a-81b9-62152c9235e5/mitutoyo_digimatic_indicator_543-470b.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cf539bf-9d58-4ff9-b820-be222c0dbb96/soxuverisifodapesexi.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_off0000c846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC846 5600 bytes
SHA-256: 02771ba50d23f18a3b1e0cafe83b6d661cb132b5ab31787a831608980b68df31
font_01_sfnt_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 11648 bytes
SHA-256: 2f4d49ad8739b4b9e064849f38565032ccda8e73a2f66a652fd7f90027ec988f

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