Malicious PDF — malware analysis report

Static analysis result for SHA-256 967ef2fd5843e95a…

MALICIOUS

PDF

78.3 KB Created: 2021-01-03 06:34:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8ea2faf5775f9cfae8d5f81b7aa98c87 SHA-1: 879d8e2cac7e41cfe4cc12c1cd6e60b3897973e8 SHA-256: 967ef2fd5843e95ab6de9b3317a483f3a6835a38d0a97c0b0dcafc780c00db82
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it likely serves as a phishing or malicious redirector. It contains a large number of embedded links pointing to external PDFs hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure.

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://ggtraff.ru/aws?utm_term=baltaragio+malunas+knyga+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419623/normal_5fa8d2df7f96b.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/bezodagupu_nomamepo_kagexagojo_bikafusixer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417656/normal_5fd68d8b64e2b.pdfIn PDF document text
    • https://rabexowubomisuw.weebly.com/uploads/1/3/1/4/131407155/dolederipa_gekugalaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382976/normal_5fbbe2ee715f7.pdfIn PDF document text
    • https://tagepixibupiz.weebly.com/uploads/1/3/4/5/134586800/vegoxasojo.pdfIn PDF document text
    • https://bajomunimiru.weebly.com/uploads/1/3/1/0/131070213/tepopevujadigine.pdfIn PDF document text
    • https://zomanuvid.weebly.com/uploads/1/3/4/4/134477829/5e5a60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387821/normal_5fe382cd5d916.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427076/normal_5fefc77ede93b.pdfIn PDF document text
    • https://jutovadisew.weebly.com/uploads/1/3/4/7/134720627/xavud-fowojexenur-luwugemubate.pdfIn PDF document text
    • https://ziganuridu.weebly.com/uploads/1/3/0/8/130815115/gofosamalomopurade.pdfIn PDF document text
    • https://cdn.sqhk.co/sirejeforox/hiiaBhi/kipewebe.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/ec957784-9498-4953-8694-8e64ba0d3a1c/23218963790.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 3844 bytes
SHA-256: 3068f03e5eb8ff3f30c8db03c3304392a8bd19928971a79ed2a49f2485d6d2aa
font_01_sfnt_off0000f0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B7 5576 bytes
SHA-256: b085e862f3465179d9551f49dcb78db752b280ce0703fa9ebef1d17d478521db
font_02_sfnt_off000103b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 12568 bytes
SHA-256: f2c529205781c5d9720b95dbcdc1aff97e5874c20b661fc6143adbde4bd7dff5

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