Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2547a2bbd85f643…

MALICIOUS

PDF

77.3 KB Created: 2021-03-20 19:09:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a1ab408e5958d152f47a34c3e03c2456 SHA-1: d4f1e987596a21580b7fc5f666185e631c104659 SHA-256: d2547a2bbd85f6430bb94f2e441ff71357be493ba48ee9a0f62c3579e87c2005
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a suspicious domain ('midufefew.ru') that is likely used to host a malicious payload or redirect to a phishing site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm on disposable hosting, further suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=java+thread+interview+questions+and+answers+for+experienced+pdf PDF link annotation
    • https://kevujabuguve.weebly.com/uploads/1/3/4/7/134745112/ridigoga.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/ghd9hbF/wobevovaxesosewut.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawomo/bzihFv6/events_this_weekend_east_bay_area.pdfIn PDF document text
    • https://cdn.sqhk.co/wotirixa/e47oCzD/95319291979.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/h8Hgcih/revuvujij.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/fPfjgti/sniper_ultimate_assassin_2_hacked.pdfIn PDF document text
    • https://xadaxiwunitari.weebly.com/uploads/1/3/0/8/130814235/pejar.pdfIn PDF document text
    • https://zuxafeduf.weebly.com/uploads/1/3/4/6/134626046/pepakedowopogife.pdfIn PDF document text
    • https://mazanotofubemiz.weebly.com/uploads/1/3/2/6/132681192/venixorefem_megegagosewig_fukolune_tubirub.pdfIn PDF document text
    • https://guzagixugowe.weebly.com/uploads/1/3/4/6/134687381/fatug_jegog.pdfIn PDF document text
    • https://cdn.sqhk.co/talexadu/jcyI4gf/donamakewazubuluvesidenu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wawuzir.epizy.com/52564849222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a90f075-306a-41de-bd1f-370701dc6c87/segugel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03412f53-0a8f-4ae9-8c5b-34d51934e5fa/calculo_integrales_dobles.pdfIn PDF document text
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_cfad5083d9c647f7b5a585ce0a782bd5.pdf?index=trueIn PDF document text
    • http://zipoxibel.epizy.com/acc_aha_guidelines_2017.pdfIn PDF document text
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_5c535c454363464c894929213347e88e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb985f52-fff9-42a0-ad13-9d8c8e75d14c/stacked_washing_machine_wont_drain.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_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 5548 bytes
SHA-256: c734d484523d55a1c296a28b8677240b6d39f24ecd9f54e44d87d740fb1d6af4
font_01_sfnt_off00010680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 10084 bytes
SHA-256: 784aa48a809a64050cf1f6cce796b95cca391ce2e5fae9a5afd03c966a71e28e

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