Malicious PDF — malware analysis report

Static analysis result for SHA-256 319c2cb8f4bd1d26…

MALICIOUS

PDF

81.2 KB Created: 2021-03-20 10:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ec194c62bf9a1194c6ff3a1472f5311 SHA-1: 8028bd6fb00358b112751821462a6b084fa86b85 SHA-256: 319c2cb8f4bd1d26a8c713c26a8ae2cbcab9a1a19d4c6c23218974bd020b4b10
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various domains, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=wow+bfa+voldunai+rep+guide
    • https://fimosezit.weebly.com/uploads/1/3/0/7/130775491/walapotovebin.pdf
    • http://jiteruruw.sportsontheweb.net/golds_gym_xrs_50_part_19.pdf
    • http://nujatofu.22web.org/73442663051.pdf
    • https://gimisezijumini.weebly.com/uploads/1/3/1/4/131453276/c9d70db40b.pdf
    • http://rupitori.66ghz.com/manual_de_organizacion_y_funciones_de_una_empresa_comercial.pdf
    • https://lifexusubanipi.weebly.com/uploads/1/3/4/3/134377686/wexunesobonifarazasu.pdf
    • https://namoxatiki.weebly.com/uploads/1/3/4/4/134477177/gidisiv_wefopajesanara.pdf
    • https://mudulavodeg.weebly.com/uploads/1/3/1/0/131070753/4e0ca412.pdf
    • https://kobexozabegubom.weebly.com/uploads/1/3/3/9/133999893/zomifewene.pdf
    • https://koduxiwarutuj.weebly.com/uploads/1/3/2/7/132740502/8406111.pdf
    • http://kiwufaninini.22web.org/8421932401.pdf
    • https://vesixogis.weebly.com/uploads/1/3/4/8/134863987/sirivibirolisod.pdf
    • http://wipunemobak.mygamesonline.org/what_does_casual_dating_mean_to_a_woman.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/532a861a-53e4-49f2-8532-1319d9e0bc1a/nipifimulorunudib.pdf
    • http://lojubefogugiku.onlinewebshop.net/pobefexazewezer.pdf
    • https://uploads.strikinglycdn.com/files/8a0e5668-a98f-48d8-abea-a385fc309ddc/is_linksys_velop_good_for_gaming.pdf
    • https://uploads.strikinglycdn.com/files/5fb3d50b-b3b1-4a04-b8ca-d88f8d0a82ab/modern_horizons_magic_the_gathering.pdf
    • https://uploads.strikinglycdn.com/files/1f7abead-b478-46b2-bfe1-f053f5b2dd6c/contrato_de_arrendamiento_vivienda_word_mexico.pdf
    • https://uploads.strikinglycdn.com/files/da0e2945-9681-41ae-86e5-e179c833d436/2014_maserati_granturismo_mc_stradale_0-60.pdf
    • https://uploads.strikinglycdn.com/files/917897df-8015-49dc-9b22-1892b1699911/51976894327.pdf
    • http://lusuvurulap.epizy.com/principles_of_helicopter_aerodynamics_leishman_free_download.pdf
    • http://zaxuzut.atwebpages.com/apple_mac_user_manual.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_off0000ffbd.bin
26ac077bbe5c706f013669bd473e459d0f6af39d8cd8f7acfad95974aeae785a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBD 5336 bytes
font_01_sfnt_off0001120c.bin
b29abb5ff3e749d899b83e6f495383adc928a8318a99265faedebfa2a47b1eae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1120C 11068 bytes

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