Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18503e5ee76bb09…

MALICIOUS

PDF

77.5 KB Created: 2021-02-02 07:45:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 672e879af621513b3d86abb090d5f433 SHA-1: 761828544397c11e44b1b95d32e0a2e5dae70d86 SHA-256: f18503e5ee76bb09a0e0a5ec7aa54a047b24c386dde900e0cd77ca0d19af4eb3
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning and distributing malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one pointing to a suspicious PDF file. The 'SE_INVOICE_LURE' heuristic suggests the document's content is designed to trick users into clicking these links. Although no scripts were directly extracted, the PDF structure and link farm suggest it's part of a phishing or malware distribution chain.

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/123?utm_term=how+to+fill+out+thirty+one+order+form PDF link annotation
    • https://cdn.sqhk.co/kuzosexiwugu/Dhejfd8/true_football_manager_3_patch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420752/normal_60011f0732c72.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/gihaxgd/kibigiluwewimutazawurun.pdfIn PDF document text
    • https://puxetesotomu.weebly.com/uploads/1/3/0/7/130739839/widugafuze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367279/normal_5fe08a6ee0755.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414672/normal_5fe10110820b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449410/normal_5ff046d8cbbf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528959/normal_5fd615ca9711f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369505/normal_5fe545046961d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486033/normal_5fde3b5c31b03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368468/normal_5fe292bf5213c.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/fjeghjp/alienware_aurora_r7_mouse_and_keyboard.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366632/normal_5fc9217d705d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451565/normal_5fd7fb20d5af2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496378/normal_5ffcb67a8358d.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
    • https://s3.amazonaws.com/vatosolikijike/buddy_toss_hack_game.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/80416159203.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/gavirasetuwepitesin.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/fusenogelomaluzi.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_off0000e5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C8 4796 bytes
SHA-256: 52511a31782ef20ea0746985f7772bae0b33e36f3bdb1151d1560c45ca89e5cd
font_01_sfnt_off0000f5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 10824 bytes
SHA-256: 0e9e9dd7061cb501fa2c956848ede994f22339775d536cb1a98780ce79ea646e
font_02_sfnt_off00011a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A99 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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