Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b178270b9b47c3…

MALICIOUS

PDF

89.2 KB Created: 2021-04-12 17:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 541462e6ba4ac6b6baf37f1fcee60477 SHA-1: 5fe8ad0b807cdb17089d8afea795a0dd02c5682a SHA-256: 71b178270b9b47c3134079515141e8fb0d06e4fca46e1add9114f5e15cf6080e
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are on disposable hosting and utilize UTM parameters, indicating a link farm or phishing attempt. The content, though heavily obfuscated, appears to be related to weight loss, a common lure for malicious campaigns. The presence of multiple PDF link farm heuristics and a high ML classifier score strongly suggests malicious intent, likely to redirect users to potentially harmful sites.

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://golowaki.ru/strik?utm_term=what+to+eat+to+lose+fat+not+muscle PDF link annotation
    • https://cdn.sqhk.co/tagodepa/cpiehgc/28279168546.pdfIn PDF document text
    • http://getepitisux.mywebcommunity.org/bareburger_nutrition.pdfIn PDF document text
    • https://cdn.sqhk.co/runolisor/ieuBijt/mindshare_mena_dubai_careers.pdfIn PDF document text
    • http://usacarins.com/wuxugitozedes624c6.pdfIn PDF document text
    • https://cdn.sqhk.co/lerutefo/nfbYsi3/sulevoredasigegavenikubig.pdfIn PDF document text
    • https://cdn.sqhk.co/pibutuvopedu/xJTmjf4/79918400311.pdfIn PDF document text
    • https://cdn.sqhk.co/ketusugedi/c0c8jgT/zijituneruruk.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/4acFkeK/hop_ball_3.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/hihgAib/36677641052.pdfIn PDF document text
    • http://doorstepcomputers.com/cpm_answer_key_chapter_4g6czn.pdfIn PDF document text
    • https://cdn.sqhk.co/nesorosuxim/eh6ifif/caricare_stickers_su_telegram.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/jugobudevediwagfuwo7.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/onde_ocorre_o_ciclo_de_krebs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_b03dbfc94cdf47f49ac6a12f03c65fc3.pdf?index=trueIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_7296167890354da9a7bd28052ecef721.pdf?index=trueIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_501ca98d53f04b14934bd3031bd41818.pdf?index=trueIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_96d9a402747c4ee282363f0573f5325d.pdf?index=trueIn PDF document text
    • http://fudejavifexas.epizy.com/different_approaches_and_methods.pdfIn PDF document text
    • http://zibarubo.epizy.com/academic_reading_and_writing.pdfIn PDF document text
    • https://24976a62-ea59-4ca6-8500-d0bd08f9a094.filesusr.com/ugd/65a075_5000531dd17b49d2a5ce5ee5c07d4e13.pdf?index=trueIn 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_off00011e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E78 5036 bytes
SHA-256: f8e06e44bc76009c3c950545fbfded1c53375d6b71e9942a5fe4c48eed9095d5
font_01_sfnt_off00012f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F87 11260 bytes
SHA-256: 1431f6c0498c9aa053b124d0fdf1f6e0da69799f9af2aa0132d1b7d5738edb67

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