Malicious PDF — malware analysis report

Static analysis result for SHA-256 0956933c8bba3104…

MALICIOUS

PDF

83.8 KB Created: 2021-04-07 06:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 607527a34c2ee174246a0036537c17d0 SHA-1: 9731faaae59655c76472bcd0116b9ece0e96c5e5 SHA-256: 0956933c8bba3104c977b2f85c0848519056eb3b909520a337e2fd980127ef2f
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure malicious destinations. While no scripts were explicitly extracted, the PDF structure itself likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/award?keyword=absorption+chiller+carrier+pdf PDF link annotation
    • http://gizigevom.mygamesonline.org/arranging_things_leonard_koren.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454965/normal_5fd3143caa5b2.pdfIn PDF document text
    • http://online-bestshop.xyz/kerewakowavibozuwi6qgpx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445101/normal_606d055e39086.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393190/normal_5fcf1676c5825.pdfIn PDF document text
    • http://dihtyar.online/king_andrew_the_first_political_cartoon_effect0u3cf.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/janaxunafokilonafomokif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411480/normal_600a0cf0e1f20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482648/normal_605e0ff59f3a9.pdfIn PDF document text
    • http://pearhaidhr.fun/vaduz5cbwj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379034/normal_601cf74e679c7.pdfIn PDF document text
    • http://hamsterbig.com/zeworopabexagenemavemoput8ig9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490724/normal_606c9061c514a.pdfIn PDF document text
    • http://verification-help.com/philips_norelco_1280x_42_sensotouch_3d_electric_shaver0gpaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425533/normal_601680f47dc96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413838/normal_60364fb838f1e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jezevenakos.myartsonline.com/lujedexozatigajewibovutil.pdfIn PDF document text
    • http://zovibeviniga.myartsonline.com/94795179287.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/rawevar.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/bugekupudanipanunim.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/tissot_t_touch_2_titanium_review.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/59806160334.pdfIn PDF document text
    • http://daximogosamov.myartsonline.com/conversion_of_analog_to_digital_signal.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/fitbit_flex_2_charger_with_reset_button.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 5160 bytes
SHA-256: c90edc5916d0a719a5b9c93aca9d0eb88330436ac78fbfb79df8d83adcd13359
font_01_sfnt_off00010beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEB 12072 bytes
SHA-256: 011ccb6ffe3351ca64f0b84721d7a22209068242be73bac9cddb9f0dee1cf575
font_02_sfnt_off00013398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13398 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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