Malicious PDF — malware analysis report

Static analysis result for SHA-256 a222487e5bfcadc3…

MALICIOUS

PDF

76.7 KB Created: 2021-03-29 07:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 606546d48a5423dd619fe27aa9c94671 SHA-1: 901d395e1d35a5d4f65e3e8928f5cac81469b2b9 SHA-256: a222487e5bfcadc31873fffcd0e69df7d974c77f2bd1d27f348d6abd66e8523b
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, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially untrusted domains.

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://resalured.ru/strik?utm_term=whitehall+study+1 PDF link annotation
    • https://cdn.sqhk.co/pisomuma/hclhhuG/directv_remote_guide.pdfIn PDF document text
    • http://ubzvp.com/pepadebuzapiniduxolozeza4hi8l.pdfIn PDF document text
    • http://xomuwisazuxorex.22web.org/baby_gate_with_cat_door_black.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/RjeGj3u/what_song_would_you_dedicate_to_me.pdfIn PDF document text
    • http://meetly.space/dofudoxovinoxelilasajjquae.pdfIn PDF document text
    • https://cdn.sqhk.co/kuniremolu/ihoEX7o/hex_empire_2_full_screen.pdfIn PDF document text
    • http://fruitnaturs.space/where_can_i_watch_jersey_shore_season_3_online_for_freecafct.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/cecc0298-f277-4cb4-9958-6aca468cd89e/what_song_has_the_most_figurative_language.pdfIn PDF document text
    • http://taxopewik.rf.gd/sowesubudaberuvexalenavu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59d5d633-813e-42ab-968b-19be6a32b83c/kipad.pdfIn PDF document text
    • http://taraxibelojexa.rf.gd/ball_valve_types.pdfIn PDF document text
    • http://jujovotusenugo.epizy.com/viewmodel_android_gradle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab4a159d-a1b4-44b9-9e0b-51f89c1821b5/gibinepuxaxigijetixilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b641a1d0-70f9-479a-b871-f183cf67d184/is_the_movie_big_short_based_on_a_true_story.pdfIn PDF document text
    • http://zojexajori.epizy.com/definition_of_organisational_culture.pdfIn PDF document text
    • http://fuxivupinamipi.rf.gd/15911979589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74133826-19b3-43bc-8bd3-ac323acc3ee7/lista_de_verbos_en_ingles_mas_usados_conjugados.pdfIn PDF document text
    • http://sidokanema.epizy.com/65606872696.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_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 4984 bytes
SHA-256: 5176a7aa541263305c1df7c1f6235ff36a138940d17b523596097ff2f25f0ee0
font_01_sfnt_off00010298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 10472 bytes
SHA-256: 8e76c3c803bfdcf1fec34e9f91d5d53654d665a7bd1fd701aee2aba1921130ae

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