Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7dbe5aa5af5a33…

MALICIOUS

PDF

80.0 KB Created: 2021-04-10 00:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: da6ac92ca3d58ba7b8571d74b7e178c0 SHA-1: b1868efeceaf34d6fc3e99800434b052f2d1ea73 SHA-256: 5f7dbe5aa5af5a33a59c8d04878420a388177881559b0466db6ec2a23fb83834
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection for phishing and trojan activity. The document body, though heavily obfuscated, contains text related to search queries, suggesting a lure to external malicious content. The presence of multiple disposable domains and link farm heuristics further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/strik?utm_term=how+to+connect+yamaha+ats+1070+bluetooth PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405946/normal_6004179b99010.pdfIn PDF document text
    • http://nipijapogila.sportsontheweb.net/kofuwisalirizuvip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389384/normal_603b2b3a54fd8.pdfIn PDF document text
    • http://vavexefane.mypressonline.com/gamudeduvoninejinujorut.pdfIn PDF document text
    • http://mixutadumekaje.mypressonline.com/65934887315.pdfIn PDF document text
    • http://fetoxuk.mywebcommunity.org/22750665576.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/applied_linguistics_cook.pdfIn PDF document text
    • http://kaboperesepasu.iblogger.org/formula_for_price_elasticity_of_demand.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://meniwaluraruki.rf.gd/bubonoxuzoweni.pdfIn PDF document text
    • https://36c399da-a80c-44c8-bdf8-ee1d737978f0.filesusr.com/ugd/738632_eb57d99bb01845a4aa61e3acdab24ff2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wewiro/blood_groups_and_their_characteristics.pdfIn PDF document text
    • http://bavodokebak.rf.gd/compelling_conversations.pdfIn PDF document text
    • https://e7e1611e-f78d-4dfd-b5ce-3be5f579732f.filesusr.com/ugd/4b76a6_7449c5e608c348bfb48269f4fbec4fea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/50616685843.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/adding_proper_fractions_with_different_denominators_worksheets.pdfIn PDF document text
    • http://sibexelopuni.epizy.com/laser_cut_extruded_acrylic_sheet.pdfIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_5f3835843b414dc48f92b134cf2e027d.pdf?index=trueIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_bb8d613303974009857c02c080c14ae0.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_off0000fadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 5512 bytes
SHA-256: 04f3fb86426b212ea39ded12bd797dddd397c65ad1b2d5c79b18962a79fa62ae
font_01_sfnt_off00010d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 10892 bytes
SHA-256: 0c865baaa12bb633661abeef597cf5d8b8479acb89f1b67c39daa8fb4481efa0

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