Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aadec183c615383…

MALICIOUS

PDF

79.6 KB Created: 2021-01-28 00:44:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c3574c68a2847b1c63b1ca2766427d70 SHA-1: e0bcfcef78209a4ec583811cb347396485001452 SHA-256: 3aadec183c615383caadaca783dcd95df246cd159cf2ae699ff40bf918d8b1a6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, with a significant number pointing to disposable hosting and employing UTM parameters, suggesting a phishing or SEO spam campaign. The presence of embedded links and the overall structure strongly indicate an attempt to redirect users to potentially harmful content.

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://leonvi.ru/123?utm_term=blue+microwave+stand PDF link annotation
    • https://cdn.sqhk.co/nodewanase/tlUhe3q/92995255617.pdfIn PDF document text
    • https://cdn.sqhk.co/jivomawufem/jajfQXu/world_war_z_game_steam.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/Khiljia/damenapurolawose.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/hgfgcYH/assistant_manager_jobs_new_york_city.pdfIn PDF document text
    • https://cdn.sqhk.co/bolukawet/giegegh/ipad_pro_2020_smart_connector_charger.pdfIn PDF document text
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/9179985.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478402/normal_5feddf44e873f.pdfIn PDF document text
    • https://cdn.sqhk.co/nananava/e9Yghf2/drag_bike_wallpapers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474997/normal_6011e3db8e79f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490269/normal_5ff533b9dc4f3.pdfIn PDF document text
    • https://cdn.sqhk.co/xenotami/hcgggid/psx4droid_droid_pro_apk.pdfIn PDF document text
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/jagebob-kuzoximodawipi-vemavogusijize-dejevoludi.pdfIn PDF document text
    • https://cdn.sqhk.co/lexebogefaj/hjijiBB/xijoxidufisu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://voxinuxo.epizy.com/piriformis_muscle_anatomical_location.pdfIn PDF document text
    • http://susesibukof.epizy.com/dress_pattern_making_books.pdfIn PDF document text
    • http://mejovusemuvov.rf.gd/glencoe_health_answer_key_chapter_4.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_off0000f75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75A 5284 bytes
SHA-256: 501b674d95092cb71892f318b526d549f34e61be97536ae355e43565d7c02709
font_01_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 11680 bytes
SHA-256: 1c06393583dac3e41f49b249975b39e0d54bd5f08ce0082e1df622c41c893135

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