Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2616789506e94d…

MALICIOUS

PDF

80.4 KB Created: 2021-03-18 13:57:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b887757b8918fa92a2d46b509fc64fcd SHA-1: b2806b73b35e953dae1facc0008a893661a91423 SHA-256: fd2616789506e94da224dd179d59fdeb92d9df9df7ef7c6745269c35904358a8
186 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 external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to deliver second-stage 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://gimoguvi.ru/wix?keyword=3.2+using+the+periodic+table+study+guide+answers PDF link annotation
    • http://rowefuzoj.mygamesonline.org/4558736093.pdfIn PDF document text
    • http://boevoenlp.com/which_cheese_dominos_useisan6.pdfIn PDF document text
    • http://hisgohar.site/77104898031uaxl9.pdfIn PDF document text
    • https://cdn.sqhk.co/korebuxaguz/ZicoMhb/87436807908.pdfIn PDF document text
    • https://serivuzoforin.weebly.com/uploads/1/3/4/3/134334639/tapixame-vodetimukijudo.pdfIn PDF document text
    • https://cdn.sqhk.co/donoluri/hijzTQX/74124356834.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/id8ifT9/pretty_print_to_string_python.pdfIn PDF document text
    • http://jugepawe.medianewsonline.com/dispositivos_de_procesamiento_para_una_computadora.pdfIn PDF document text
    • http://ladiluvame.mypressonline.com/black_and_decker_cordless_drill_combo_kit_with_case.pdfIn PDF document text
    • https://rarejitidod.weebly.com/uploads/1/3/5/9/135993923/bulapor_bibal_xupese.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/idieWhe/xixelojexem.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/5872bb27-4b83-4451-af99-237d59ea4b2d/how_do_i_redeem_v_bucks_on_switch.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/11176379277.pdfIn PDF document text
    • http://dexizijisub.atwebpages.com/votadutefabupejimusev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd512a30-aef2-45e7-ba67-c58c833b7ec4/what_is_hem_ankle_rehab.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 5904 bytes
SHA-256: 6e25dd0ad060a6d9dfb62d760ceea739ef38e167706b459c7d8ab4de8ce9e805
font_01_sfnt_off00010ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBF 10984 bytes
SHA-256: a43914e63934ff02bfafa6c618334f1096325849da129e5e09a96225c8644c04

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