Malicious PDF — malware analysis report

Static analysis result for SHA-256 896e3f54b2f2182f…

MALICIOUS

PDF

78.0 KB Created: 2021-05-01 07:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b5865a0d743f4c78900445a076124616 SHA-1: 4591938135f88b3b1b728ccf3b730cc6e47f7a8e SHA-256: 896e3f54b2f2182f4c9edf562f33e94ac5296ff96546988b56910713c07c5085
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to connecting an LG soundbar to Alexa.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/strik?utm_term=how+to+connect+my+lg+sound+bar+to+alexa PDF link annotation
    • https://xofijenafoku.weebly.com/uploads/1/3/5/3/135349300/sikotovixoxosaxitajo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378605/normal_604840d22d3d7.pdfIn PDF document text
    • https://xekuvezenigut.weebly.com/uploads/1/3/5/3/135346982/falutixarukuwasud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426545/normal_5fffb66e7df40.pdfIn PDF document text
    • http://ripugusulufiluj.getenjoyment.net/what_if_movie_kevin_sorbo_streaming.pdfIn PDF document text
    • https://lurevovikofa.weebly.com/uploads/1/3/4/6/134693735/kakagezabadolo_fazup.pdfIn PDF document text
    • http://fuxisileza.mywebcommunity.org/how_to_operate_sanyo_air_conditioner_remote.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491671/normal_5fc75cf340898.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_4107f05cfe85426289f1a29f22723673.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/composition_of_functions_worksheet_5_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5a73b66-78c9-437f-8d5b-8fd225a668ad/dbpower_hd_1080p_action_camera.pdfIn PDF document text
    • http://satawakerexe.atwebpages.com/past_simple_online_exercises_negative.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/vobufapuvuxikigi.pdfIn PDF document text
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_7f4be2acf31546b0aea03a73d5676492.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae692b63-151d-4e36-b032-16d6045024e1/2146023442.pdfIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_877489948c0443628c3dce4d0e7a74d3.pdf?index=trueIn PDF document text
    • http://guseboses.atwebpages.com/business_ideas_in_kenya_2020.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_off0000f4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 5624 bytes
SHA-256: 618193bc69bb0339ff945d4d6a05d90fd63852d454ae49f3925091ad11406cec
font_01_sfnt_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 10076 bytes
SHA-256: 80dfb5c40e316c862234d658b26171da6aa8063778b34e92c51d19b5bdaee31d

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