Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1ad0a60c5b71a2…

MALICIOUS

PDF

76.8 KB Created: 2021-04-10 18:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fe1463016b472eb70bbc5e5bc4d74069 SHA-1: 7fb72331ddd9f6c0fd1e0db0ff3a335939884b46 SHA-256: 5c1ad0a60c5b71a265b00f720ee6bdeebe1735775e6cd975a4e7322588109285
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded URL points to a domain associated with phishing or malware distribution. While the document body is heavily obfuscated, the presence of malicious links is a strong indicator of a phishing or malware delivery attempt.

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://crophysi.ru/strik?utm_term=frases+del+libro+el+arte+de+amar+de+erich+fromm In PDF document text
    • https://cdn-cms.f-static.net/uploads/4421213/normal_603e638bb009c.pdfIn PDF document text
    • http://gikadoketu.iblogger.org/logo_game_quiz_answers_pack_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443608/normal_606397176ed59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405930/normal_6046fed8ee12b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402953/normal_603a11bf02e87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446016/normal_606898c408134.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_58a20e4bd20546108cfd7fac85cef88c.pdf?index=trueIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_bb1dc6b5696e4e64b5a5df4150756003.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rufonali/63732906568.pdfIn PDF document text
    • http://mivowejow.rf.gd/nixopowebofosevufaguzorap.pdfIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/53781192652.pdfIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_b19e514015744d9885c46c7e16f0741e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/vekuzewuposisalavolodu.pdfIn PDF document text
    • http://nosajesu.rf.gd/79885642455.pdfIn PDF document text
    • https://f33eab34-52c4-4f1b-91c9-7c5ec1255b8f.filesusr.com/ugd/9d0374_9c2ca03e53d9405c8d022f88a6652ee0.pdf?index=trueIn PDF document text
    • http://sezeludijufoma.epizy.com/bovezewoxala.pdfIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_17067686abaf4d0e860893adee292528.pdf?index=trueIn 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_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 5356 bytes
SHA-256: 856e184250825ff77f49839a041ce24f17646012fe795f5b0e73457f241a982b
font_01_sfnt_off0000feaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 11384 bytes
SHA-256: 721b27614bb8e1409a30a8480dc7f3e129d129ccebb1341830560357635007c4

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