Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37f12e483725dd1…

MALICIOUS

PDF

72.9 KB Created: 2021-03-18 12:22:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5ef7010626c0651d387e133e2ffc444c SHA-1: 2499bc864f1d31da0e42160934820e91a7f5e926 SHA-256: b37f12e483725dd1775f4f165a12c9ec73ec6734e25d551e3e4deff48fa2eb16
126 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics, including ML and ClamAV, as malicious and potentially a phishing trojan. It contains an embedded URI pointing to a suspicious domain, pelibifir.ru, which is likely used to host a malicious payload or redirect to a phishing site. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true malicious intent.

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://pelibifir.ru/strik?utm_term=baby+girl+clothes+clearance+australia PDF link annotation
    • https://cdn.sqhk.co/tiwefuxab/CgiQrYq/pudumisexopinesazupoxi.pdfIn PDF document text
    • http://ruxenawuxovogu.getenjoyment.net/free_diary_of_a_wimpy_kid_movie.pdfIn PDF document text
    • http://piwofoterif.sportsontheweb.net/lojulozoda.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/Riejd3z/panumelemenimazixelonix.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/cjibeiZ/town_farm_truck.pdfIn PDF document text
    • http://vobajujabu.mywebcommunity.org/nomenclatura_de_alcanos_ejercicios_resueltos.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/Cogeig4/tizelunokakir.pdfIn PDF document text
    • http://sunufosabupes.scienceontheweb.net/xewurosaxaxobugawobis.pdfIn PDF document text
    • http://kakorezikudu.mypressonline.com/seradovutosinenoxi.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/c2d010cc-7cb4-4354-854f-06d74710c1c6/data_science_major_berkeley_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/280f3971-d687-45ea-8fd0-619d67af5cd6/funukogurezagikef.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/50230996831.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/46580866077.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/98359948694.pdfIn PDF document text
    • http://molezegifa.rf.gd/how_to_treat_bumps_on_your_lip.pdfIn PDF document text
    • http://meduzifovum.epizy.com/59130762506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72b48473-78b4-447d-82ad-35797d56e931/cuanto_pesa_1_metro_de_tela.pdfIn PDF document text
    • http://raduniti.epizy.com/32576767051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d79041-03f7-4244-8874-41062a430921/safety_not_guaranteed_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eb514d7-af93-4415-a0cd-c1b2525374f8/tukukuz.pdfIn PDF document text
    • http://rosedosoxibi.epizy.com/86092675504.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/31792311259.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_off0000e006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE006 5352 bytes
SHA-256: e1fac1b6928d9d89496ab1ed6b43f0aa983a634f837f58bebcbcc097ec0ccbae
font_01_sfnt_off0000f23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 10552 bytes
SHA-256: 44ca864f18e7c7977c56bce45136510ae5f45269f230dd46cc8ba13a69eb1033

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