Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb13867505fe864…

MALICIOUS

PDF

76.3 KB Created: 2021-04-02 15:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cf18c5ec180c60d088ecc1aa22b667c3 SHA-1: ab62e9dafdab2dbba7a42a3986d491067464241a SHA-256: 4eb13867505fe864b45c94aa83063fd218ee64768108d78f3eb1a04c25e7272f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to 'introduction to animals worksheet answers', which is a common tactic to entice users to click on malicious links.

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 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://xezojetit.ru/wix?keyword=introduction+to+animals+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408323/normal_602b0bcf89af9.pdfIn PDF document text
    • http://bestita.space/82043972943eo263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389354/normal_601e437c24a05.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/small_animal_clinical_pharmacology_and_therapeutics_2nd_edition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489412/normal_5fc96b900fca1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415962/normal_602c6c8280eed.pdfIn PDF document text
    • http://sberhome.ru/sanyo_tv_remote_instructionsnumb1.pdfIn PDF document text
    • http://vopagokiniki.mypressonline.com/darosekitejumuki.pdfIn PDF document text
    • http://phrensy.co/how_do_i_get_directv_on_my_firestick8onwr.pdfIn PDF document text
    • http://fakaripeti.xyz/49288226677tux4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480582/normal_5fe10ed060062.pdfIn PDF document text
    • http://dobilarujokux.sportsontheweb.net/el_alquimista_howard_phillips_lovecraft.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2881d7c-e219-4de3-9abf-a37e6f11db7a/the_better_angels_of_our_nature_lincoln.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a708962d-2826-41dc-85d5-9a2d7cbab856/where_is_the_sim_card_in_a_lg_flip_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6c208ee-33a6-40c7-b7dc-0977e24bc1b6/37991721071.pdfIn PDF document text
    • http://pekomuvave.myartsonline.com/learn_korean_with_bts_weverse_price.pdfIn PDF document text
    • http://fusozevukatamir.atwebpages.com/solid_state_chemistry_class_12_ncert_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba19725d-90a8-4aeb-b1e0-71ab5ce1f202/how_to_fix_squeaky_graco_swing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57de4c6b-dedd-4fcb-a9b9-0dd6f6da34f3/fields_of_reading_10th_edition_free.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_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 5272 bytes
SHA-256: 69f79d1e37e010df8f8e94b8c59cfbe18fe8740219411da22c79dfecf260b5cf
font_01_sfnt_off0000fe75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE75 10928 bytes
SHA-256: bd4ee880723e77920416f6761bebdf2a7f6f9820ea5ee320dc2a0469a51dcb0b

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