Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d5792451ac9ad1…

MALICIOUS

PDF

79.1 KB Created: 2021-03-18 08:31:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9890a3a9d30a8cfdbff4bf13b2605008 SHA-1: 9047faa1099bf264bc01947a500c1eee2381eaa8 SHA-256: 93d5792451ac9ad1799cf20e76bf9adc952622a90573fbe0d1afc77282788166
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs, with one specifically pointing to 'bologen.ru/award' which is likely a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to obscure malicious links within a large number of disposable domains. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it is designed to redirect users to malicious content, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/award?keyword=basic+arabic+to+english+dictionary+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492536/normal_603f839e66b5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471488/normal_6026ec0f4fd7f.pdfIn PDF document text
    • http://taduzexemi.22web.org/bakifabumovurovozasabam.pdfIn PDF document text
    • http://kuzososo.mygamesonline.org/applied_physics_sem_1.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/what_are_the_two_types_of_printer_and_its_function.pdfIn PDF document text
    • https://tosofeguwus.weebly.com/uploads/1/3/4/3/134321705/320653.pdfIn PDF document text
    • https://powagexufofuw.weebly.com/uploads/1/3/4/7/134748875/b5d04cc.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/rajezetixuzu_jumaweribe_puzusav.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/vedaritifikakumeni.pdfIn PDF document text
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/fasaxitelidemizon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_60485ab660a46.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/cuales_son_los_sintomas_del_covid_19_brainlystaka.pdfIn PDF document text
    • http://mirror-x.org/drink_facts_did_you_knowralcl.pdfIn PDF document text
    • http://gbarb.me/75656040133gnu6t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_8794f907d1494927b9d598ea6d6b1b0c.pdf?index=trueIn PDF document text
    • http://fipizojuj.rf.gd/naponudareresiw.pdfIn PDF document text
    • http://mawokale.myartsonline.com/38959067846.pdfIn PDF document text
    • http://tofaveme.epizy.com/fikodanavozejin.pdfIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_cae525baa009479c8c8c81ee7b4c8963.pdf?index=trueIn PDF document text
    • http://wipibefab.onlinewebshop.net/how_to_teach_a_furby_to_talk.pdfIn PDF document text
    • http://jugututinotu.rf.gd/identifying_polygons_worksheet_2nd_grade.pdfIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_a6cc5253140542c7b2d1a08df19160da.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_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 5708 bytes
SHA-256: faaf9087670e47a90233f761a6709767519845af035fc29518e60d91ec58a4fe
font_01_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 11696 bytes
SHA-256: 03761e3846f4ae496c98f508337f4f866e234bedb4b5bf058780444dc2a6a79d

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