Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8439d41368f3f89…

MALICIOUS

PDF

74.1 KB Created: 2021-01-11 13:58:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 02eb0a75f4bf728417bd45db755dc0c0 SHA-1: 9a0bbe1b1526a65920cb18e6e73bb5c5ae1e4fc8 SHA-256: c8439d41368f3f8967123403efb7850f192583f68eb77b31c3f4848ce8c9c471
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 of which point to disposable hosting or redirector services, indicating a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/aws?utm_term=free++adobe+camera+raw+full+crack In PDF document text
    • https://site-1177153.mozfiles.com/files/1177153/car_loan_calculator_with_tax_and_trade.pdfIn PDF document text
    • https://sowufaxekip.weebly.com/uploads/1/3/2/7/132710719/8722993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383446/normal_5fe89e461431e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418991/normal_5ff2974f9732b.pdfIn PDF document text
    • https://site-1176882.mozfiles.com/files/1176882/reversionary_life_estate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419206/normal_5ffc0287c2c90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_5f8846a08e929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f87582b267ca.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/Kifghib/81800466251.pdfIn PDF document text
    • https://site-1177775.mozfiles.com/files/1177775/tonalenergy_chromatic_tuner_and_metronome.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480756/normal_5fcecf48126d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414486/normal_5f9be802b0675.pdfIn PDF document text
    • https://site-1168513.mozfiles.com/files/1168513/nadajizisunifi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000d568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD568 4888 bytes
SHA-256: 813b71d275838baecff5f38ba8df8030c51bd5f0e4230e12ba0ddad0e50e2048
font_01_sfnt_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 11012 bytes
SHA-256: 7b93c0454bdd28e06f10eec1cb573b36e520fc59b586f8984497b0505765d59b
font_02_sfnt_off00010b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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