Malicious PDF — malware analysis report

Static analysis result for SHA-256 998dd7a79764ae0a…

MALICIOUS

PDF

85.0 KB Created: 2021-05-21 19:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a0e4087a861adcc71fe10c14a862d559 SHA-1: 0a2b18309a2a5cc320028de1f9cf61952b398bf3 SHA-256: 998dd7a79764ae0ab42b4109665a26d6c41b8db637e039b4a6f07931c71e040c
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-hosted PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself facilitates the distribution of these malicious URLs.

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 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.
  • 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://xezojetit.ru/strik?utm_term=silverzone+maths+olympiad+sample+papers+for+class+3 PDF link annotation
    • https://banepopewux.weebly.com/uploads/1/3/4/2/134234854/bapowuwaluvixinigi.pdfIn PDF document text
    • https://wugowimuvup.weebly.com/uploads/1/3/4/7/134762233/0c9a1c557801.pdfIn PDF document text
    • https://mibakadediwo.weebly.com/uploads/1/3/4/5/134584598/doloreduvofamivose.pdfIn PDF document text
    • https://nobaloledajasom.weebly.com/uploads/1/3/2/6/132681012/3787523.pdfIn PDF document text
    • https://botugesoxa.weebly.com/uploads/1/3/4/5/134509905/bezakegezofu_ravid.pdfIn PDF document text
    • https://kovorugoza.weebly.com/uploads/1/3/1/3/131383314/zulejilijamego.pdfIn PDF document text
    • https://sumajodezidozi.weebly.com/uploads/1/3/3/9/133997227/4fcf8.pdfIn PDF document text
    • https://misekijenag.weebly.com/uploads/1/3/1/3/131380320/zaravoteluwiwiwigudi.pdfIn PDF document text
    • https://petizigosi.weebly.com/uploads/1/3/4/9/134903326/xosaxufep.pdfIn PDF document text
    • https://siwuluwavati.weebly.com/uploads/1/3/4/7/134756127/riwibetililawet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/sinurepetixufom.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/nuwobufezamefezimo.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/nhl_all_star_game_score_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/giruzijerosewawogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0772b7e0-3229-4ff8-a7b6-d252183620f1/ma_driver_license_renewal_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca46654b-78f4-444c-8767-00fa2ba31e03/bissell_pet_hair_eraser_canister_vacuum_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/bombay_film_all_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1f9c4ea-4b2a-4bcf-a113-1424c261f45f/33093014615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aa82da1-e0b5-4a34-b8ca-64a0d947d1e5/korean_audiobooks_for_beginners.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10029 5664 bytes
SHA-256: 233827bd40ad1ddc014fea53a5226494b9184ed5e0474212b87b2ae4242542f4
font_01_sfnt_off00011343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11343 10924 bytes
SHA-256: c01eec03e4bd42d9d665ed237a4bc12a14604e971448e6b47a1aecc9dc67c3aa
font_02_sfnt_off0001387f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

Open this report in the interactive analyzer, or submit your own file for analysis.