Malicious PDF — malware analysis report

Static analysis result for SHA-256 518894bab31149a6…

MALICIOUS

PDF

107.1 KB Created: 2021-04-27 01:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 963f4f3a0c9c6171c8bdcdac92860bf3 SHA-1: b196f3aecbdc6d82d4043c65f6aee0fab813d7ee SHA-256: 518894bab31149a6e9e2f74dbd8dd3925884bf22ae3d24d8529feccbc355bcc0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, contains text fragments that appear to be a lure related to 'critical theory'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/strik?utm_term=critical+theory+today+chapter+5+summary PDF link annotation
    • https://cdn.sqhk.co/dosazuleg/gdggOgd/70357362339.pdfIn PDF document text
    • https://cdn.sqhk.co/difanemifal/B7iajgp/terminator_dark_fate_cast.pdfIn PDF document text
    • https://nixixufusolawig.weebly.com/uploads/1/3/4/8/134882604/76519fe2234e1.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/xuzuzexidewejitofer.pdfIn PDF document text
    • http://dusikazo.mypressonline.com/c_est_et_il_est_exercices.pdfIn PDF document text
    • https://cdn.sqhk.co/sunawopi/jbCidHo/stupid_zombies_4_game_download_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/iihhef5/96373328558.pdfIn PDF document text
    • https://vejikawotepux.weebly.com/uploads/1/3/4/8/134887167/ludivojukulowusod.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/AgeDhdW/car_eats_car_apocalypse_racing_mod_apk_download.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/f142acf3-fcaa-45cc-bbe4-6f8b6d7b98f6/82977568595.pdfIn PDF document text
    • http://vovojoj.atwebpages.com/dell_inspiron_17_5000_series_ram_upgrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dba00487-8570-4c5d-98ee-8a7a56dac35a/john_deere_js63_lawn_mower_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b260377-8898-4ecb-a187-5472559ee7ac/lolizebuxusexad.pdfIn PDF document text
    • http://tosabukevosubar.myartsonline.com/pojekovimatesawatoziso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d9ced4c-7f65-4971-a5b4-12ed85552502/social_learning_theory_bandura_1971_citation.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_off0001667e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1667E 5444 bytes
SHA-256: 8160f62c1d0ae3bcb83213aab6c9c2bf472d5c6e5bb4569675e06244b8aff323
font_01_sfnt_off000178de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178DE 10584 bytes
SHA-256: c9f82035c573c47ffca5acfb9c8d67479bd5c6de5dda352efc401f89cbd46d4d

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