Malicious PDF — malware analysis report

Static analysis result for SHA-256 1845aedbe1ef6143…

MALICIOUS

PDF

74.8 KB Created: 2021-04-04 14:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e3aad44eaa9acf419f61f1ea01965bec SHA-1: bc8d2024872790adeb879a97933d9a1a739ea1ba SHA-256: 1845aedbe1ef61432d8bf41318f6221a6e2f3acbd651c9dc2b5dc65bfd901f6a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and hosted on services commonly used for link farms. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this behavior. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or SEO spam distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/strik?utm_term=niv+life+application+bible+large+print PDF link annotation
    • https://cdn.sqhk.co/muwanije/hbijfie/50365316187.pdfIn PDF document text
    • https://jadozuvar.weebly.com/uploads/1/3/5/3/135312187/4742962.pdfIn PDF document text
    • http://italywow.pro/33757639923vy45c.pdfIn PDF document text
    • http://marketes.pro/28059393423qxqg7.pdfIn PDF document text
    • https://cdn.sqhk.co/pofifarim/65OAijS/colorado_switchblade_laws.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/ZGITkxq/siritojenilugawunabori.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/92jdrjf/vetixisutozufegobet.pdfIn PDF document text
    • https://cdn.sqhk.co/legusovej/INjaggD/temple_run_3_game_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/ChJqhfz/maxeruzigijuk.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/HFfnhc4/74280941019.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/jfBhaha/37507540495.pdfIn PDF document text
    • https://fedusinejedutim.weebly.com/uploads/1/3/4/0/134040989/d25817364a225.pdfIn PDF document text
    • https://cdn.sqhk.co/kujufemom/jNibojb/ikonics_crystal_blast_pro.pdfIn PDF document text
    • http://chtotakoeverti.biz/37186833497x44o7.pdfIn PDF document text
    • http://pixell.store/used_dixie_chopper_silver_eagle_for_sale7qhze.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://uploads.strikinglycdn.com/files/c1b1ef37-ff97-4264-8c72-442ff5d8d2ba/extraordinarias_mujeres_de_la_biblia_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e610586c-9130-4deb-a970-01e7bfe9a8fe/kegofolajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ebc22e3-d097-4bf0-843a-125d4c2c6cd2/do_the_work_steven_pressfield_free.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_off0000d74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 4960 bytes
SHA-256: 46aed0f645fd25adf13b5ee6b4c39744d9fcc6829006be55c07692d90e7b73fa
font_01_sfnt_off0000e838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE838 11240 bytes
SHA-256: 01ed7660cf508162c3a00f911b57b99102635aeef405facd5807b94a982e0da8
font_02_sfnt_off00010e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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