Malicious PDF — malware analysis report

Static analysis result for SHA-256 5180356e55c11401…

MALICIOUS

PDF

83.6 KB Created: 2021-03-23 20:37:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 418fce04bebf5b539c5728e46d1d32d0 SHA-1: 3a856cfb737ec4e6230aabebbd24175fa532d0f0 SHA-256: 5180356e55c11401c52c7d5d627c1d7e3b17e9a42ffd687dee6d6bb2ec596121
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting a tactic to manipulate search engine results or redirect users to malicious sites. The presence of a URL related to 'nevada security guard exam answers' indicates a lure to attract victims. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=nevada+security+guard+exam+answers
    • https://cdn.sqhk.co/nuzitomizaj/iarMjbX/25324360640.pdf
    • https://cdn.sqhk.co/xovujiroveg/5Hhe5hh/tabletop_christmas_tree_hobby_lobby.pdf
    • https://cdn.sqhk.co/jukusenefow/ighAjt3/funisufuka.pdf
    • https://tefuledajejus.weebly.com/uploads/1/3/1/4/131437322/825250.pdf
    • https://kojelokawuzu.weebly.com/uploads/1/3/4/3/134341929/0332685801b3.pdf
    • https://cdn.sqhk.co/sepufaziru/wgjecP5/488798865.pdf
    • https://jiromozuno.weebly.com/uploads/1/3/5/3/135387519/385554cd3c6b.pdf
    • https://cdn.sqhk.co/savujegu/hehdge1/tojezafuvimokos.pdf
    • https://cdn.sqhk.co/setewefasari/hcYPhbu/dusobovo.pdf
    • https://telewebejuta.weebly.com/uploads/1/3/1/6/131607630/sijutanarikenipuzase.pdf
    • https://cdn.sqhk.co/vinikawikuve/x8ififE/battlelore_command_apk_obb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a538be40-4f7f-49be-9315-5b397a7f608e/permutations_and_combinations_exercises_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/4d94f70c-46fd-4e21-a9ed-5fef6128470f/biggest_rivers_in_the_us_by_volume.pdf
    • https://uploads.strikinglycdn.com/files/4a5045f7-7c61-4aba-b6de-af342ed4773d/most_important_events_in_spains_history.pdf
    • https://uploads.strikinglycdn.com/files/c84817de-246b-424a-aa85-b4c65acf32ef/dark_souls_2_int_faith_weapons.pdf
    • https://uploads.strikinglycdn.com/files/4b61c294-9714-4185-82c0-6cc1da60aeff/32490973841.pdf
    • https://s3.amazonaws.com/suxuzubojut/letter_from_a_birmingham_jail_full_audio.pdf
    • https://s3.amazonaws.com/suxugipipolazog/7654887623.pdf
    • https://uploads.strikinglycdn.com/files/304ecd95-3b51-4a8a-82fd-0a1457597027/wejigarumosugivakurum.pdf
    • https://s3.amazonaws.com/kuxuxemu/centella_asiatica_pharmacology.pdf
    • https://uploads.strikinglycdn.com/files/1ecafa44-cfbb-4715-aa75-96c03a8560af/fejojunonev.pdf
    • https://uploads.strikinglycdn.com/files/34400fe3-0059-400b-a63e-b91cf96d99d3/baniwugori.pdf
    • https://uploads.strikinglycdn.com/files/23b57207-f4f6-4493-a03c-2f9fdcc35aaf/dibopuguraxuwoxeza.pdf
    • https://uploads.strikinglycdn.com/files/a9400c66-ae29-43b5-a6f5-81dd5f3b0a72/15023989062.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010687.bin
ed01a5e3e10c1b2c0759e32a042fc20ddad418222552ac88e62e472ff883fe74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10687 5516 bytes
font_01_sfnt_off00011958.bin
7a221dfdc1f4b70d2f6339d74d115b46f7dfb78ad33a8a25ab1c97d3e79357e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11958 11576 bytes

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