Malicious PDF — malware analysis report

Static analysis result for SHA-256 e716c99cc8077468…

MALICIOUS

PDF

77.2 KB Created: 2021-03-16 19:13:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ac4d7626a2becf9e280560f201977c3a SHA-1: 904147db861c00cebae9cafd16f68d193bca5c51 SHA-256: e716c99cc8077468e8e27e671d2366178a6a6a39c50da12b7e4de9969e6d7cd5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://gimoguvi.ru/wix?keyword=the+grapes+of+wrath+movie+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4394071/normal_603d569b32b03.pdfIn PDF document text
    • http://mrshadow.net/top_100_classic_golf_courses_in_the_ususp9r.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/sisag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461201/normal_60464c5616bd4.pdfIn PDF document text
    • http://complerbnp.com/926690208731iigp.pdfIn PDF document text
    • http://naturebiolog.space/legikusagebomeecvux.pdfIn PDF document text
    • http://cesaregaspari.com/algebra_1_multiplying_binomials_worksheet_answers141ll.pdfIn PDF document text
    • http://itanto.space/badimaneiavs2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373779/normal_6000d976ea051.pdfIn PDF document text
    • http://proita.space/tokumeniwikumevijuzaqfuaz.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/what_is_the_food_energy_stored_in_plants_and_animalsnrzfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487007/normal_601da838b667b.pdfIn PDF document text
    • http://amsidisi.xyz/brainpop_main_idea_answers055c3.pdfIn PDF document text
    • http://cmb-accueil.com/sawigozubedeb8r21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418963/normal_60075366d4fad.pdfIn PDF document text
    • http://lakshmi-store.ru/48422573569nkn1v.pdfIn PDF document text
    • https://titajava.weebly.com/uploads/1/3/4/0/134096001/rebiraretorimaz_wumisabipeku_xideruva_nowogexuno.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_e9c66b647da54bd38f1f65d500116291.pdf?index=trueIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_f3da4681a8aa4b1f93ac9e26cad793ad.pdf?index=trueIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_111562c6ac344f6b85810bf7c1d28630.pdf?index=trueIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_87d07ec9ebe64b58bc185d7e235232f9.pdf?index=trueIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_55812ef0c7b34d6986c82cdec1baea39.pdf?index=trueIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_18dc93390d284b1486d03fe33ca18e09.pdf?index=trueIn 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_off0000f16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16F 5384 bytes
SHA-256: 5945f57851566712831de888e5ab50ff18cef84d80fe01385888656c74b47de9
font_01_sfnt_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 10304 bytes
SHA-256: c15c0263a77979f3c16cba2e2ab55364ff2cc94c6401f92c96e030ce63c77673