Malicious PDF — malware analysis report

Static analysis result for SHA-256 9def9436a011799d…

MALICIOUS

PDF

74.5 KB Created: 2021-01-27 12:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5f691596d0d79a991ea636c2b4ef7db5 SHA-1: bd0e714282c8a7acf271533d9cac696d24e04f64 SHA-256: 9def9436a011799d1dc45c0ff6fd47d2fced7bb66b048c927c782f2eddd4fc9b
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, and it contains numerous embedded URLs pointing to disposable domains. The document body, though heavily corrupted, suggests a lure related to 'assigning oxidation numbers worksheet with answers', which is likely a pretext to encourage the download of further malicious content. The presence of multiple external URIs and the 'link farm' heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=assigning+oxidation+numbers+worksheet+with+answers PDF link annotation
    • http://fsbsiod.com/ramapatcgxm.pdfIn PDF document text
    • https://gazuxupoje.weebly.com/uploads/1/3/4/1/134108966/9121652.pdfIn PDF document text
    • http://dkshlyap.ru/lapimetanefisimi785kg.pdfIn PDF document text
    • https://cdn.sqhk.co/liwewajawab/R2sw1gZ/mobile_home_kitchen_cabinets_remodel.pdfIn PDF document text
    • http://winoorama.space/clinical_medicine_consult6h340.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/8jhihjh/bomob.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/jchiDic/wradio_en_vivo_emisoras.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453754/normal_5fde5dec8afb7.pdfIn PDF document text
    • https://wilowukodol.weebly.com/uploads/1/3/4/8/134881933/rokiwe-fisedujigibib.pdfIn PDF document text
    • https://tezijetukiresu.weebly.com/uploads/1/3/5/3/135394197/dufof_tajutosezeludud_jiveda_tefubov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377933/normal_5ff681112f1ee.pdfIn PDF document text
    • https://ligegumipiwefu.weebly.com/uploads/1/3/3/9/133999845/robisus.pdfIn PDF document text
    • https://tubuwixufadone.weebly.com/uploads/1/3/5/3/135315283/piponazakixer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500679/normal_5ffdb3cc2d751.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/PPhhjeb/head_soccer_unblocked_premier_league.pdfIn PDF document text
    • http://lnstagramsupportlives.com/33653147952tqfgw.pdfIn PDF document text
    • https://sitapiwagese.weebly.com/uploads/1/3/0/8/130814355/8653226.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/nudasijaked.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/a_room_with_a_view_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/7248013552.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_off0000e462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE462 5560 bytes
SHA-256: b6b806b9461fcdde554ba244ee2c4eab0247b23b4922103e3067a5fd4e70aa63
font_01_sfnt_off0000f734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF734 11032 bytes
SHA-256: 91ee4c34ada5d01fce0733e0270feedf4407e3d735c57f2c78704bde494139a0

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