Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f99900cd2a1ed9…

MALICIOUS

PDF

82.1 KB Created: 2021-04-23 04:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd953e71ac15a3692ead17334e3c2284 SHA-1: 9c7bfe1c00556e739722afe89cd67b9a7c183420 SHA-256: 36f99900cd2a1ed9b77d395139d24c7389de714b540e0914cab281c7329a487c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggests an attempt to distribute or redirect users to malicious content. The primary IOC is the URL 'https://kuzutuzo.ru/strik?utm_term=the+revenant+screenplay+pdf+download', which is presented as a lure for downloading a screenplay.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=the+revenant+screenplay+pdf+download
    • https://cdn-cms.f-static.net/uploads/4486765/normal_5fe910c5d37fe.pdf
    • https://cdn-cms.f-static.net/uploads/4390373/normal_603f0fb6716e9.pdf
    • https://kusejatakobex.weebly.com/uploads/1/3/1/4/131438299/59313d.pdf
    • https://static.s123-cdn-static.com/uploads/4453142/normal_5fe4c02770f49.pdf
    • https://butusokusumowa.weebly.com/uploads/1/3/5/2/135294155/zenatefe.pdf
    • http://fawaxifiwuzodil.scienceontheweb.net/50655898858.pdf
    • http://nodefiw.medianewsonline.com/63212366202.pdf
    • https://bukenazupe.weebly.com/uploads/1/3/4/5/134584610/saxaxo_xatuzusenured_zogejarumipupe_fagenave.pdf
    • https://kinojakabajowus.weebly.com/uploads/1/3/4/7/134774968/6352defba5e3ad7.pdf
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5fdb121e472bb.pdf
    • http://tarigutese.mygamesonline.org/13311369512.pdf
    • http://zhigina.ru/488589705899513k.pdf
    • https://cdn-cms.f-static.net/uploads/4377128/normal_6011c87fd8569.pdf
    • https://cdn-cms.f-static.net/uploads/4370541/normal_604fbc40564ac.pdf
    • https://juwudusufutibor.weebly.com/uploads/1/3/0/8/130873872/soviteji.pdf
    • https://cdn-cms.f-static.net/uploads/4393044/normal_6069387469d6f.pdf
    • https://cdn-cms.f-static.net/uploads/4367646/normal_604a3a933bcc2.pdf
    • http://meine-gebuhrenfrei.com/dell_7010_sff_release_date37mlk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/42224e11-4e49-421c-8cdf-1c7c8902d242/20513166343.pdf
    • http://wegamaluperetuj.atwebpages.com/nazowoduperalatalibotu.pdf
    • http://ziwemasux.myartsonline.com/75175057490.pdf
    • https://uploads.strikinglycdn.com/files/7a336d31-bfdc-446b-a9c9-71ca82d1ffd4/how_to_reset_adt_alarm_system_without_code.pdf
    • https://uploads.strikinglycdn.com/files/805526f5-8c6e-41d4-ae01-daf3c8653fe1/chick_fil_a_superfood_side_salad_calories.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102ed.bin
785aa35fdd53b56fb6aaa9c7f61a55add43902c513673d50c436e2777fc0fad7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102ED 5448 bytes
font_01_sfnt_off0001158c.bin
22dbe84e17059d2b415488fdb8cb647cf0aca41a5a8d1d1444bdef3c4facdd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1158C 10972 bytes

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