Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7cc75b849aee166…

MALICIOUS

PDF

80.0 KB Created: 2021-03-01 02:33:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 24b4fbcabe85152a3438fa9782868136 SHA-1: a4c3ac5228a769a74663b7a11b9b65b32dfaa053 SHA-256: c7cc75b849aee166e559d7e3c63136b44f5a60b4c9b00324f9f678193f801ed3
126 Risk Score

Malware Insights

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

The sample was flagged by ML and ClamAV as malicious, with specific detection as Pdf.Phishing.Trojan. The presence of numerous embedded URLs, many pointing to disposable domains, strongly suggests a phishing or malware distribution campaign. The PDF structure itself is also noted as a link farm, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=what+is+resistance+in+training PDF link annotation
    • https://cdn.sqhk.co/gesokusa/hhNhfhc/micro_pig_for_sale_near_me_uk.pdfIn PDF document text
    • http://meetsoda.pro/ben_10_3d_games_for_android0qrmz.pdfIn PDF document text
    • http://health2health.online/veterowazupitcpjpp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484126/normal_603bb9209ab84.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/7jCgcgj/simple_gingerbread_cookie_recipe_without_molasses.pdfIn PDF document text
    • http://kiramosowufotir.22web.org/what_are_the_parts_of_the_front_page_of_a_newspaper.pdfIn PDF document text
    • http://netzamka.ru/65541780704wr8b4.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/fyvBidI/puvesubosawogudawojobawo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489587/normal_6004519372fe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484994/normal_5fd6363415a44.pdfIn PDF document text
    • http://reliables.ru/20946863813yotka.pdfIn PDF document text
    • http://dezlice.ru/35546552610traeu.pdfIn PDF document text
    • http://quinzsy-studio.design/lumanixemimikibivasipatulo4xvq.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/watch_neon_genesis_evangelion_online7dtui.pdfIn PDF document text
    • http://vukenetux.22web.org/firex_smoke_detector_chirps_twice.pdfIn PDF document text
    • https://cdn.sqhk.co/ribafesupuro/kje8ijQ/carnival_fiesta_slots_free_chips.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476593/normal_60269fd732e8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suzebotazolonav.epizy.com/el_cambio_climatico.pdfIn PDF document text
    • http://vapufebifuv.epizy.com/romofowulokiparozijovifu.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_off0000fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9A 5044 bytes
SHA-256: 88dd3ce51e6c881b9116a107e4f423cab39041822050ab4bf5f727cc1a64ff1f
font_01_sfnt_off00010dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCA 10792 bytes
SHA-256: 5e57afc317ef494964b7d1ef587f61eee78f527790858e8072331aebe646ec15

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