Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7bfb23726c01db…

MALICIOUS

PDF

77.3 KB Created: 2021-03-30 04:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8300106f020648f74717216a1ef6862c SHA-1: 74d11573b3829740180d8c9ad2fff078aaf17cd8 SHA-256: 6b7bfb23726c01dbbb8b95bd1e0999042610375169cbfe0b06855df5c0268412
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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.
  • 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/award?keyword=titratable+acidity+of+milk+pdf PDF link annotation
    • https://cdn.sqhk.co/tategupet/iWI5jiK/standard_electrical_symbols_for_architectural_drawings.pdfIn PDF document text
    • https://cdn.sqhk.co/fapetemiji/ghhYe1G/cold_war_gameplay_reveal_date.pdfIn PDF document text
    • https://cdn.sqhk.co/nesuxozajek/WjaKgiz/78725125499.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/sBJMhax/62942737592.pdfIn PDF document text
    • https://cdn.sqhk.co/gepumenujeme/hcFigMR/amazon_gutschein_code_kaufen.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/icTgd4u/dejakobilufajamefemug.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/Ez6jdha/wikipedia_soul_knight_codes.pdfIn PDF document text
    • http://patamekuzon.iblogger.org/85463210326.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/52e8f965-50d3-460b-a1cc-54e27b56dfee/zepeziru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d103d9ae-c210-471d-9ae9-d00adeacf734/zoxalaritokotadijiju.pdfIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_8023f133795049e6b0cb778e40da0c40.pdf?index=trueIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_13b4465684c24e6f97782139683d0a53.pdf?index=trueIn PDF document text
    • http://banumekopi.epizy.com/xuvatelorujubovosejexef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27b418fd-5fc6-4687-b62a-6d5dd282c87b/frases_libro_el_arte_de_amar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c8427cb-99c2-430b-a288-aa3986d7fd28/fasilavutomitegosopi.pdfIn PDF document text
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_65403a61382c4a109e9c98b2a2147bb0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0393810f-4cfb-4120-badb-c8c9ca48024f/genre_film_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc3beb63-4729-4c96-a032-28639c5acb21/premiere_property_group_bend.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f95054d2-5cde-4dc4-82c3-43df38531eb0/why_is_my_dual_flush_toilet_not_filling.pdfIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_75c2baf475724a6fb5cf672b85bb3060.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be32bc47-736d-466d-84c0-2b8772509e75/68041403669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/241dafb8-56b8-4c32-a79f-e23110cf0878/zuvivukolemo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 5376 bytes
SHA-256: 2f619c15ccc124f40f6a32cfebc3b0cba6ea677aa11bab568883b9c956c76b6b
font_01_sfnt_off000101cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CB 11256 bytes
SHA-256: 7e250486b7655171c5a38838eef991b72639f32a31c442a4f5178713090a6b85