Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7fc48d41af3c0b7…

MALICIOUS

PDF

73.1 KB Created: 2021-03-04 08:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5b4d457a90d5e27fbd13acce7d2724db SHA-1: 959362472af394b3b2d3c0ba5afab785d3735164 SHA-256: c7fc48d41af3c0b794a7019d3a1102c427151aa117660996d64a1b1a8d90cb43
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of a malicious redirector is a high-confidence indicator of a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=gospel+of+peter+resurrection In PDF document text
    • https://static.s123-cdn-static.com/uploads/4495976/normal_5fc802d72b38f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475864/normal_6012dbc12a2b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487618/normal_602ba87e22cf2.pdfIn PDF document text
    • http://momentshop.space/debajevenarogesetk9357.pdfIn PDF document text
    • http://flathead.us/tovari67ry8.pdfIn PDF document text
    • http://gachihyper.xyz/fogipuzunurukaxarebivu2yw3i.pdfIn PDF document text
    • http://alifan.store/what_is_it_called_when_the_sun_goes_down9f0wk.pdfIn PDF document text
    • https://fixasamajiwige.weebly.com/uploads/1/3/4/3/134318971/4086199.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/Ubjighi/vuvokibizidatidubutin.pdfIn PDF document text
    • https://cdn.sqhk.co/xoguvamev/hjoO4S6/jexetul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407057/normal_600837a44f058.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/fDIe3ih/94118949691.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496812/normal_6025e3be0631c.pdfIn PDF document text
    • https://cdn.sqhk.co/ropimipaf/cideggv/powojexawitabuxite.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472186/normal_5fe4579d08676.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384304/normal_5fcc7763a4e61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417986/normal_5ffc55c0c3823.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_off0000e4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 4832 bytes
SHA-256: 05f72b5eec302816290a5b56576c388ea8580595480847d218fab28eae49a895
font_01_sfnt_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 10072 bytes
SHA-256: 89a551d5d7f8f14fb680bc19aa36f2a1afc66cb5c7a76ed553aedcbed874139a

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