Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ced257a20ae60f1…

MALICIOUS

PDF

72.9 KB Created: 2021-04-11 22:40:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c00be25202f713d49af4f1c7a54a0f9e SHA-1: 031a80756f6b9fae5ecf096133ace2542c7edae0 SHA-256: 6ced257a20ae60f1b29084e792a3cf4cef58c02f62ee0304a22517f1d2d803cf
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

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.
  • 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://jacksth.ru/strik?utm_term=who+goes+there+comic+book PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459481/normal_5feb025e0d7a6.pdfIn PDF document text
    • https://cdn.sqhk.co/nupegefozub/geK42ox/mikurowilekisa.pdfIn PDF document text
    • https://cdn.sqhk.co/mafozerekat/gjhoKgh/underground_street_racing_car_mod_apk_unlimited_money.pdfIn PDF document text
    • http://orehi-siberian-force.online/free_download_crochet_patterns_for_beginners0r0y0.pdfIn PDF document text
    • http://ideal-it.fun/fallout_4_settlement_guide_survivaltvkxt.pdfIn PDF document text
    • http://idealicaitaly.site/what_is_the_word_count_of_the_harry_potter_booksqyko6.pdfIn PDF document text
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/1439922.pdfIn PDF document text
    • https://defuzeje.weebly.com/uploads/1/3/4/8/134883556/c37525520.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381081/normal_5fcf237857acf.pdfIn PDF document text
    • http://savadaqwe.space/london_metal_exchange_steel_price_graphltvn4.pdfIn PDF document text
    • https://xakowuval.weebly.com/uploads/1/3/5/3/135316831/sesilogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5fd6376c14050.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/c68e310e-2a3b-465d-9e83-637bfe0c347b/63040948016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d46d50ba-7847-4275-af5e-712dbd1a2b48/96147712279.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13e2520e-66fd-4b8e-a0ca-94bc756f144e/replacement_pump_for_drinkwell_platinum_pet_fountain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e751489d-a90b-41a6-ab55-e4af2441a90b/logo_design_competition_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aab94064-9286-4b2c-9d9d-75475ddb6788/4174739540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/066dede5-f5c7-479a-b8c3-077f4053cf0f/88239316591.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_off0000e0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CE 5188 bytes
SHA-256: 1d49ed161bc12bcce4aadc745451ac2c0aab78700e6b74e3b89d4c260928bbaf
font_01_sfnt_off0000f266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 10676 bytes
SHA-256: 15ffcdeb60f6755daffe1553c4cc75397807471021dc596b394228ec9d1f1264