Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bd31a98a51e955…

MALICIOUS

PDF

85.8 KB Created: 2021-03-15 02:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e4c9b770d687678841ed9ffb2e8780e9 SHA-1: d810e26f9559d089751b1a4f4c7c6e2ca1c52fb3 SHA-256: c4bd31a98a51e955757046cda181ff17d284fa7e4597a006750120e797d15bfb
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence ML classifier flagging it as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm hosted on disposable domains, suggesting a phishing or scam attempt. The primary malicious URL identified is https://midufefew.ru/award?keyword=cholinergic+and+anticholinergic+drugs+pdf, which is likely used to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://midufefew.ru/award?keyword=cholinergic+and+anticholinergic+drugs+pdf PDF link annotation
    • https://pimapavidi.weebly.com/uploads/1/3/2/7/132740410/2baa4eba35.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/hgghijB/kumegaruxaxizedejune.pdfIn PDF document text
    • https://woxoxuwavi.weebly.com/uploads/1/3/4/6/134689382/1999d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456369/normal_5fff512a0ec6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417813/normal_5fe1690f1e27f.pdfIn PDF document text
    • https://cdn.sqhk.co/mudemodox/fhhR0jf/93422614426.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/ibhdhdW/lulubonemugif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459467/normal_5fe38b5fe36de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450421/normal_600cc631da2ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407318/normal_5fda57cc52893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447662/normal_5fd8460f94230.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/gegdu4i/pujaxeku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489045/normal_5feed763e1a60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494891/normal_6031fe05c453b.pdfIn PDF document text
    • https://vebafuxitupum.weebly.com/uploads/1/3/4/8/134890404/837894.pdfIn PDF document text
    • https://wofefuveti.weebly.com/uploads/1/3/4/3/134348775/wifabokilibunemimeba.pdfIn PDF document text
    • https://sarogixi.weebly.com/uploads/1/3/0/8/130813770/kodetugirunowidiveza.pdfIn PDF document text
    • https://cdn.sqhk.co/gamakokub/4jcpXvT/antes_de_morirme_remix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eac6b63-2984-4675-939f-eaf8db3358ca/lobetuleduni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a299a8cc-8c16-4f55-97e7-7cf1e4f80bad/xedubusulos.pdfIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_fbb286c3a5fb4ed7a786491b4b03b2a6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7124cc9-fc92-48fe-beee-c733a0a0cc98/zisuwuvubororogibaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71702b13-74ab-4328-a2d7-333e7e3c8eb3/somewhere_over_the_rainbow_chords_ukulele_judy_garland.pdfIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_b740a85b11894808859753353a3a4e72.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_off00010faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAA 5320 bytes
SHA-256: adc26abb181a13eafc7697bb30bc055779d425827e4de1a1efc630094fb420f4
font_01_sfnt_off000121bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BC 11812 bytes
SHA-256: 288ed4470ad701cd2c5e12419febfa7ab5d21c7af258e95d260b943de36911a3

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