Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0d3138b83d97ba…

MALICIOUS

PDF

79.7 KB Created: 2021-03-04 16:15:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cf26de9c44adf0cbad6a5c4b977fe0c5 SHA-1: 384055cdff5e251c6b02f8737e7fcc221207deed SHA-256: ef0d3138b83d97bac0eb420e3a66360bba8f0684273df6a8ca741d94221ca8f5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL `https://botokaw.ru/123?utm_term=que+significa+la+corona+de+adviento+catolica` is presented as a search result, further supporting a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/123?utm_term=que+significa+la+corona+de+adviento+catolica PDF link annotation
    • https://cdn.sqhk.co/vepefilome/qhihbD0/table_football_soccer_3d_program.pdfIn PDF document text
    • https://cdn.sqhk.co/gozigawefo/jiijaZr/73725973834.pdfIn PDF document text
    • https://cdn.sqhk.co/gagufatemo/LJTjfic/why_did_chicken_cross_the_road_funny_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/hgrajhu/43305818150.pdfIn PDF document text
    • http://boevoenlp.com/72406903287paiwa.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/yghiggg/33803221899.pdfIn PDF document text
    • http://opticsystem.website/legendary_warriors_game2r21f.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/fatikonavori/jilamanawuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c003222-cc07-4942-a2d8-9c0614f4fcf2/yamaha_mg16xu_review.pdfIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_648ad46c0f98417fbfbd1ee8b28ddffb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezutu/basel_iii_finalising_post-_crisis_reforms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d17cc9e-1925-46ce-90bd-1857fc18a1f2/graco_snugride_30_manual_espaol.pdfIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_abf50c94d7754d2e98a806b8ebacf1a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5253fba-defa-4670-ac12-608391661683/67086517118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff4af1b-f327-48f3-a509-99d7774a6bd2/37493406551.pdfIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_1f5ad07865844628944c2bc714416f02.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazixipame/name_with_birthday_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/iata_two_letter_airline_codes.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_2a2648de20a6418b9d76b696a3696996.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7e011bf-553a-4d4a-a963-d2eb2e0e5e2e/62556800351.pdfIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_8a383f3c794e4378b36b833834ea7123.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8a3e9f4-9fc0-4947-a6cc-31eda3ce4b0a/kinepaka.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_off0000ed41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED41 3080 bytes
SHA-256: 8574919c7c8a9f024103958ce015253c5a24b8e646cdb5f787658918713f2b2b
font_01_sfnt_off0000f849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 5308 bytes
SHA-256: 0d31b44ce0fd16e8f977453d1317c1680ad67ef348d91cac5230a61c5759d820
font_02_sfnt_off00010a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 11908 bytes
SHA-256: 516e14ee2bff79a935c38b168e2c7817817159c3da4b9cd4edf5a86acf63d8b6

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