Malicious PDF — malware analysis report

Static analysis result for SHA-256 99610086bc5bf60d…

MALICIOUS

PDF

72.3 KB Created: 2021-03-15 16:41:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ccba9d49e5e30f017e6e0b243f5e4116 SHA-1: 0a5ee62ec607a2e269f188d5da7fbf3821a7bd22 SHA-256: 99610086bc5bf60d2cdefad00410267891df8c20f57379fb22cfc9b12f26c10d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malware or conducting phishing attacks.

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://golowaki.ru/123?utm_term=bd+3gp+natok+free PDF link annotation
    • https://cdn.sqhk.co/xiselaza/QsLjeZF/62205988688.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459654/normal_6001cb138da68.pdfIn PDF document text
    • http://toolsbestpricemicrometer.site/dirt_devil_power_expressa7ax7.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/zavuwezizufevobolimesi.pdfIn PDF document text
    • https://cdn.sqhk.co/tanusulirava/bgjipii/pizzaiolo_breville_review.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/gta_san_andreas_cheats_pc_superman_cheat_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/hjb0kia/gowotagajepaduzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447276/normal_5fd632de8ffd6.pdfIn PDF document text
    • http://trysoda.club/95278484503gbsb8.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/dh23hcI/mega_odds_free_tips.pdfIn PDF document text
    • http://sell-toclick.online/mitomebuwenopuwadisojapa1azi7.pdfIn PDF document text
    • http://femonejigajape.mywebcommunity.org/black_and_decker_waffle_maker_removable_plates.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/dR2CyNJ/raxutugonuwoniwaj.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/sonujutopizixawijo.pdfIn PDF document text
    • http://present-mag.ru/rangkaian_half_adder_dan_full_adder8ruc9.pdfIn PDF document text
    • http://phillipen.online/wofukotenixobusajofuwoni4iofy.pdfIn PDF document text
    • http://lafowesezojo.scienceontheweb.net/princeton_review_sat_book_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://solejow.myartsonline.com/william_blake_paintings_london.pdfIn PDF document text
    • http://watusatuvor.myartsonline.com/33656312724.pdfIn PDF document text
    • http://fovawipemezipu.myartsonline.com/85891013556.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/lobefovek.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCE 5276 bytes
SHA-256: b900cf4fe0a42a8e72494a298e786c497d420f23e7580c8ab236e4a213f798c5
font_01_sfnt_off0000ddde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDE 5728 bytes
SHA-256: d01e9f2c17b74cb6e4e3e0a5e79092e70195bdc14578393b0319dd5663fc4959
font_02_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 10480 bytes
SHA-256: 340f07a6259477006db007b701f42f869d44954ddeee8078db7aee1d57999034

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