Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca8532bfbe94fba…

MALICIOUS

PDF

66.8 KB Created: 2021-03-04 19:44:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 44860830110425eb9b4845757acda4e4 SHA-1: fe588121cec8debc27e1f30a9ae4c5b8f0ca2258 SHA-256: 6ca8532bfbe94fba82d7f0acbd63750e1171000e746f34a073d9526a6a67c1b0
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL pointing to 'jottigo.ru', suggesting a redirection to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent by identifying the PDF as a link farm on disposable hosting, designed to obscure the true destination.

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://jottigo.ru/123?utm_term=macbeth+act+2+quiz+questions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405206/normal_60201ef775651.pdfIn PDF document text
    • http://vereffka.xyz/kujafefapuragklar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467936/normal_601b5714983ee.pdfIn PDF document text
    • https://cdn.sqhk.co/fevazufalul/hhXbdhc/tefuxajizomabowaxoximonew.pdfIn PDF document text
    • http://chestlune.online/gonemipove9gdyl.pdfIn PDF document text
    • http://dlkmvkoenv.info/kenmore_electric_range_oven_does_not_workxn5cw.pdfIn PDF document text
    • http://trysalon.xyz/79360293813wbo7w.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/lakakawevuvagura.pdfIn PDF document text
    • http://4kuhd.me/how_hard_is_it_to_learn_nuclear_physics9xd5h.pdfIn PDF document text
    • http://senteber.site/easy_biscuit_recipes_south_african9u6c.pdfIn PDF document text
    • https://cdn.sqhk.co/bobimugura/ZuTghzK/53593773275.pdfIn PDF document text
    • http://italysummer.space/the_sorceress_the_secrets_of_the_immortal_nicholas_flamelt97zg.pdfIn PDF document text
    • http://neojust.ru/comcast_tv_guide_not_workinguejpv.pdfIn PDF document text
    • http://senteber.site/choices_stories_you_play_pc_mod1tqek.pdfIn PDF document text
    • https://cdn.sqhk.co/sakiforivona/Z8y9yhd/zoguwabalogemewe.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/firerenalotesaganozasixi.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/eibijDa/fugologoxavibotevude.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vawerudarasikow.myartsonline.com/how_does_electronic_stability_control_work_on_a_vehicle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/747bfb9f-49a0-4f8d-8ddb-0d5d861f0e12/golds_gym_420_treadmill_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2622264a-fe62-4600-afd9-8cc8cd41fe0b/leading_change_network.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/162538f5-78cb-437a-be7a-7392a2d75dd4/why_is_pre-marital_counselling_important.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7fb752-8de1-4c4c-8b4f-63f8053a51b3/what_is_the_best_70_pint_dehumidifier_with_pump.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_off0000c8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E8 5212 bytes
SHA-256: b1ac8f419721f6a05b2dbac129e3a7bb42e9fd6a9ff2b1fbdea21aa4a824ba43
font_01_sfnt_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 10272 bytes
SHA-256: 632ea14efb1e67547509946a151cd78484fa3dc555fb55f8a0a43139c5598d9e

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