Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d0ccfd5439d65e…

MALICIOUS

PDF

78.6 KB Created: 2021-05-28 07:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67920ec6380d13c82d8c1160490a10ea SHA-1: 8d8ea8b2a0c2537352a8f7a5a846f28463b271b5 SHA-256: 99d0ccfd5439d65e5f458fe9d0a25f6ddbc62728151ab5513ed9f19b0debf6d4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to appear as search results for popular content. The primary malicious URL, 'https://dafemum.ru/strik?utm_term=the+boondocks+season+5+full+episodes+download', suggests a phishing or malware distribution attempt disguised as a download link. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=the+boondocks+season+5+full+episodes+download
    • https://gikotibosad.weebly.com/uploads/1/3/4/3/134332820/dukejama.pdf
    • https://xowivana.weebly.com/uploads/1/3/0/8/130813667/luvabitutaditavin.pdf
    • https://jirukikemika.weebly.com/uploads/1/3/4/3/134310088/jebefumavedog_rajeluwa_nerezobi_dewanodaso.pdf
    • https://duxudalo.weebly.com/uploads/1/3/4/8/134866109/bonidilitotomusite.pdf
    • https://cdn-cms.f-static.net/uploads/4470698/normal_5fda945a523d7.pdf
    • https://cdn-cms.f-static.net/uploads/4458837/normal_606c44a9d8769.pdf
    • https://dejalujufoleto.weebly.com/uploads/1/3/1/3/131378776/55081bbb8ad39b.pdf
    • https://motexajuji.weebly.com/uploads/1/3/4/4/134467272/xojikijulo_modizukizevodog_delokumobefego.pdf
    • https://static.s123-cdn-static.com/uploads/4374715/normal_5fe5e4b5eca39.pdf
    • https://talibixakezadep.weebly.com/uploads/1/3/4/5/134590085/xibexudan_wozuse_rixudive.pdf
    • https://static.s123-cdn-static.com/uploads/4485570/normal_5fcf13d0854fa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6d6cb420-65dd-4006-a8db-9799b36e172d/apex_digital_40_inch_tv_manual.pdf
    • https://uploads.strikinglycdn.com/files/6387b185-b84e-4894-9881-0c8344b8af15/counter_strike_1.6_maps_deathmatch_free_download.pdf
    • https://uploads.strikinglycdn.com/files/16a41e83-4732-4d13-9f5c-d76233e5eb84/33338828587.pdf
    • https://uploads.strikinglycdn.com/files/1cf359d1-bb17-4f84-9927-674711c33298/principles_of_microeconomics_8th_edition_ebook.pdf
    • https://uploads.strikinglycdn.com/files/debe4bc3-8724-413f-a0a5-d88893349b52/7582998872.pdf
    • https://uploads.strikinglycdn.com/files/fe07cb68-c1d2-4e6c-a048-1f679351ba81/90454501934.pdf
    • https://uploads.strikinglycdn.com/files/63172bf8-a999-4dcb-980a-09cac2674098/zibap.pdf
    • https://uploads.strikinglycdn.com/files/baffad22-534e-45d0-8d1e-fbe38a166dd4/map_of_the_world_outline_printable.pdf
    • https://uploads.strikinglycdn.com/files/3bbcd780-8ae7-48cb-b590-d0bd49891a7f/runonotapiwukoruvuzipu.pdf
    • https://uploads.strikinglycdn.com/files/711d33a3-049c-4b20-ad63-ac7457ad1654/youth_football_drills_for_defensive_lineman.pdf
    • https://uploads.strikinglycdn.com/files/ff4edf63-7312-4650-95d0-15144630eb81/how_to_remove_badger_1_garbage_disposal.pdf
    • https://uploads.strikinglycdn.com/files/4bf590be-767b-4ff9-8e51-784da34e56da/how_do_i_pay_my_dish_bill_by_phone.pdf
    • https://uploads.strikinglycdn.com/files/841ab7ac-9cd6-4e69-ac8b-49f742173522/how_to_use_the_black_and_decker_toaster_oven.pdf
    • https://uploads.strikinglycdn.com/files/90aff2e8-6356-4c3d-9644-14b477087704/72210756507.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4a7.bin
692a366b4af9c460eb35aff6c0fbf793a2cccc0a3ceab8c07d560027ef6ae1f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 5516 bytes
font_01_sfnt_off0001077a.bin
cd48e476c0a80df72753a92fcecc30f640de76a4b96997057f28263543be24b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1077A 10700 bytes