Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb160283d5fbbab1…

MALICIOUS

PDF

71.9 KB Created: 2021-03-16 15:45:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1ec93c7144362045c2ec849c21aed48 SHA-1: b7f0f19f36e383633f4b2c5bb5fca7d36e223ad4 SHA-256: bb160283d5fbbab1bc39e2db06690ecebb57241a1a2ee0243e4e485773fc2832
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and Strikingly hosted PDFs, suggesting a link farm or SEO manipulation tactic. The primary URL, https://kuzutuzo.ru/strik, is likely part of a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and numerous external links strongly indicate malicious intent, likely for initial access via spearphishing attachment.

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=how+to+pair+isound+twist+speaker
    • https://gofupadosu.weebly.com/uploads/1/3/4/8/134853885/bejuxisazitavibela.pdf
    • https://cdn-cms.f-static.net/uploads/4403565/normal_603ea487d3195.pdf
    • https://sowafumo.weebly.com/uploads/1/3/5/3/135309866/0f04cce1a53e.pdf
    • https://fubediko.weebly.com/uploads/1/3/1/0/131070718/wugudalasivaz.pdf
    • https://rivodufut.weebly.com/uploads/1/3/4/3/134369250/9999705.pdf
    • https://vimitorumu.weebly.com/uploads/1/3/0/8/130814921/7109432.pdf
    • https://vikaworapelesob.weebly.com/uploads/1/3/4/7/134702945/408dc52a7.pdf
    • http://wexixexebasober.22web.org/squat_toilet_installation.pdf
    • http://gojawufeki.getenjoyment.net/how_to_memorize_formulas_in_mathematics.pdf
    • https://static.s123-cdn-static.com/uploads/4421205/normal_5fdd62be7d4ec.pdf
    • https://cdn-cms.f-static.net/uploads/4449793/normal_60210ac4acbb5.pdf
    • https://riderasal.weebly.com/uploads/1/3/0/7/130738784/munubezo-wofupaxu-xuketeta.pdf
    • https://cdn-cms.f-static.net/uploads/4419818/normal_5fe6ca6c7dc85.pdf
    • https://cdn-cms.f-static.net/uploads/4369779/normal_6028b7dbd6665.pdf
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/2f67132.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gagolugumetuvo.epizy.com/jafibuz.pdf
    • https://uploads.strikinglycdn.com/files/03228af6-853c-4199-ba7e-48631c49c62e/prescription_safety_glasses_online_uk.pdf
    • https://uploads.strikinglycdn.com/files/0020a0d9-3ff2-4e74-8d5e-eed773bdf007/cub_cadet_ltx_1045_deck_belt_diagram.pdf
    • http://zopukugabem.rf.gd/jiteserakoxolotinimu.pdf
    • https://uploads.strikinglycdn.com/files/0032946d-64dd-41d5-ad22-7a4fa02d62bc/hush_hush_becca_fitzpatrick_movie.pdf
    • http://sidovarodefomi.rf.gd/dc_learners_permit_test_answers.pdf
    • http://nodikaduf.onlinewebshop.net/asrock_z170_pro4s_price.pdf
    • https://uploads.strikinglycdn.com/files/5192837d-4367-44d7-8df8-65a49f785f5b/rimumamorifiwixiwas.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_off0000da6e.bin
bfc3ff28256018f97091977de97e626242f2fba99bb53313d18ac4db3dacacf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6E 5036 bytes
font_01_sfnt_off0000ebad.bin
1d5487378737aa01fd713bbb2c66d03da6dec0e7ff976453a2de3bd1632effb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 10816 bytes

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