Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec89be27cbda1fc…

MALICIOUS

PDF

82.0 KB Created: 2021-03-11 10:06:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ca68ba3bc9218eb6ef7fb3fad58a452 SHA-1: 1ed252eb2d3c772c1715bb143cc0d6a585bdc8c6 SHA-256: 3ec89be27cbda1fcd27667b459dd179d4c2165563d2536b1bd352702a52ee7ef
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://nipisod.ru/wix?keyword=has+have+had+worksheet+for+class+4
    • https://jazigibebegada.weebly.com/uploads/1/3/1/6/131606339/mizugufu.pdf
    • http://construt.site/4liker_1._0_app_apkype4i.pdf
    • http://wisecreditscore.info/70271914102eldmd.pdf
    • http://trudogoliya.online/civilization_revolution_2_guidejv9wh.pdf
    • https://fadapezak.weebly.com/uploads/1/3/0/7/130775088/655533.pdf
    • http://stroymarketmetal.ru/zoxujakawawowefozm6e7.pdf
    • https://static.s123-cdn-static.com/uploads/4371013/normal_6005dfc793684.pdf
    • https://cdn.sqhk.co/lufezeralon/ggjiicM/movalaxu.pdf
    • https://cdn-cms.f-static.net/uploads/4421040/normal_60413dcb0ff6a.pdf
    • https://cdn-cms.f-static.net/uploads/4471686/normal_6040bcf15c5d7.pdf
    • https://cdn.sqhk.co/wekaradukuve/zdhajd4/gobusovo.pdf
    • http://shtampshop.ru/royal_mail_international_tracking_uksfe0c.pdf
    • https://cdn-cms.f-static.net/uploads/4489976/normal_6041d2cc75ec5.pdf
    • https://gikuxowatevu.weebly.com/uploads/1/3/2/6/132681634/9424089.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_60c5a1c3f3f042c2833a05ab22c6c5de.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5560740f-d1d4-48a2-b489-b9e4795a3a50/44339328935.pdf
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_a786785814e74dab856348ee8d24830f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7d135387-1a56-455e-a520-aea97c7a9dd6/ramuzexigubofabekebi.pdf
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_08c52c25c00748ef97b242addc341ba0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/14fd909c-5073-4e43-ad00-11985fbde09c/57449278647.pdf
    • https://uploads.strikinglycdn.com/files/2bb64a34-d003-4236-99a1-f2999eea8fab/how_to_reset_a_washing_machine_indesit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f677.bin
66c491d290f2e1ac7c3a7e6e44e53d859eb99f4379ae0339bb0b325366d5e3ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 5008 bytes
font_01_sfnt_off000107ac.bin
3231ac96f2201dcb5b9cb9923bdf51b09dc56fe04c0ce7f91473ca480a4b2ae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 11032 bytes
font_02_sfnt_off00012c98.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C98 4324 bytes

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