Malicious PDF — malware analysis report

Static analysis result for SHA-256 733b46c5eff20296…

MALICIOUS

PDF

75.7 KB Created: 2021-04-01 14:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 68281f9309f951e086e903685a59817b SHA-1: a80d462fdd89cc86e4bb7f21f84e3ea94584c9c9 SHA-256: 733b46c5eff202962ff75e34149b754e908f525c658f2f1d3e60802bbf9e234e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://pelibifir.ru/award?keyword=cd4017+fonctionnement+pdf PDF link annotation
    • https://vipizavubo.weebly.com/uploads/1/3/1/4/131407691/ac1912.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/23756019643.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/hJmdzcj/kim_kardashian_hollywood_game_not_loading.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/ijXfNPa/swot_analysis_of_samsung_company.pdfIn PDF document text
    • http://sozaxesugoj.mywebcommunity.org/wobalevixorebizo.pdfIn PDF document text
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/396499b.pdfIn PDF document text
    • https://zefemebok.weebly.com/uploads/1/3/0/7/130775969/gowoje.pdfIn PDF document text
    • http://lofoporubatul.mygamesonline.org/macbeth_act_2_scene_1.pdfIn PDF document text
    • http://sifuzifixezija.medianewsonline.com/bavediwimunubadawabiw.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/D8ij0gg/tik_tok_video_download_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/kosuxatune/Ajaiegh/17192969029.pdfIn PDF document text
    • https://mitojebani.weebly.com/uploads/1/3/2/7/132711961/8531254.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/qhe07O2/62906981695.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/ggiLagd/pes_card_collection_forum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/public_relations_manager_salary_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ed7a915-7995-40ab-b71c-af19d4e53313/pudiludage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f15b524b-b6ac-4d17-bf79-ff42f1e87065/lotabexepox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc4e9add-ff04-4c72-a1be-f61cae2a8e5b/totoxef.pdfIn PDF document text
    • http://telusomabufa.onlinewebshop.net/tubejupowokiletutij.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_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 5052 bytes
SHA-256: 2029104f9f54cd5944e64dd0c026da90acc7b0e75d872b1a34cec58ab2ab7b6a
font_01_sfnt_off0000f828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 12356 bytes
SHA-256: 3073f06111ad596bb4201cde4b5f9a9ad1564657fe53ccaa34266d6b7552c1e4

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