Malicious PDF — malware analysis report

Static analysis result for SHA-256 940b637599fbb106…

MALICIOUS

PDF

70.3 KB Created: 2021-05-17 06:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9e7a4862adc37941e7f0fd453258d904 SHA-1: cf112988933c9391335909ee68c04b3b91f3d556 SHA-256: 940b637599fbb106d8876589dbdfde7e3951288d1886ba1b4aa02ee0d57070bd
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'xajibur.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to a book review, aligning with common social engineering tactics.

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://xajibur.ru/strik?utm_term=sembulingam+physiology+book+review PDF link annotation
    • https://cdn.sqhk.co/zadoweferoxe/lXJ61Vr/one_report_southwest.pdfIn PDF document text
    • https://pepuxopotu.weebly.com/uploads/1/3/5/3/135390253/divoxub.pdfIn PDF document text
    • https://gimebupezepufo.weebly.com/uploads/1/3/4/5/134507041/397f23f.pdfIn PDF document text
    • http://bupetud.xyz/difovopebofipaxaxuzefarwji9v.pdfIn PDF document text
    • http://snapchat-alert.com/funcion_de_los_osteoclastosq3e2q.pdfIn PDF document text
    • https://liwitozawaben.weebly.com/uploads/1/3/4/0/134042828/tinubaverul.pdfIn PDF document text
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/konesututi-rukegumodilaxil-dozitawubu-zapeduwalizen.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/vusodajor_pirajojixegagak_juguz_xijedorokaziv.pdfIn PDF document text
    • http://ekbsite.ru/corsair_cx750_atx_power_supply8lw2p.pdfIn PDF document text
    • https://cdn.sqhk.co/tevimuwijile/TFgh8gh/19067943183.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/gjegfX7/garfield_rush_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/nidaruzada/ghfc47j/farmer_sim_2018_download_pc.pdfIn PDF document text
    • http://qqkaxes.xyz/excel_link_sheets_in_workbookgk3yt.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/bighdhj/amazon_driver_pay_application.pdfIn PDF document text
    • http://bluebadgeapproval.com/autel_tpms_pad_manual7uvkj.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/69b79ff5-1e53-4d54-b8a6-e6eb0f620b11/12669454549.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b0c4a17-6b8d-4ec6-a177-0dc4da1ca371/how_to_change_oil_on_miller_bobcat_250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26c723a1-0da4-44e3-a34f-f1c2f844f91e/eye_doctors_that_make_house_calls_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8fb1598-9124-4172-98d2-cc7a5f5a9c3d/95991703599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1575dee5-0b4c-40cd-8bd6-bc1dc14c8bd1/96189136566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95a291ae-1a1d-48ca-9b0e-88acc150fb01/importance_of_karst_topography_to_man.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_off0000d67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67C 5792 bytes
SHA-256: 69b41bc5942df9bcfa9feb01121880bb1a4dec59b6c85a54a333cc1f2c4d630a
font_01_sfnt_off0000ea1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1B 9788 bytes
SHA-256: aef8908e28ec4aa5c1c4dd3af8aeb9237644a497b9971eee8544f264b6290a27

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