Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c7aab6d71ad8d5…

MALICIOUS

PDF

76.3 KB Created: 2021-03-20 07:43:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dd8e4849211f04e2576d10c2117b8dee SHA-1: 262f8570548ac2dcd0478f5c9170e88c9c692fba SHA-256: b1c7aab6d71ad8d50e5f06ff70bf1ffa7e34232abc6c6d02b2d7f4c4a59f809a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, and contains numerous external URLs. The PDF structure and embedded URLs suggest a phishing or malware distribution attempt, likely using a lure related to search results or document downloads. The presence of multiple disposable hosting domains and UTM parameters in URLs further supports this. No scripts were extracted, but the PDF's nature implies it may exploit vulnerabilities or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://mezovuduw.ru/strik?utm_term=what+is+the+base+of+a+tree+trunk+called PDF link annotation
    • http://juvizex.sportsontheweb.net/epson_xp_200_will_not_connect_to_wifi.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/iVgiwib/apsc_exam_2019_form_fill_up_date.pdfIn PDF document text
    • http://rakadan.sportsontheweb.net/bloch_s_theorem.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/icNhhcm/durufigukirabaxizemito.pdfIn PDF document text
    • http://vizit.store/849598164953ukpt.pdfIn PDF document text
    • http://upgrade4me.com/kuxalobiduwuf6bwyd.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/ieSoWgi/83217024034.pdfIn PDF document text
    • http://uabiomanix.xyz/97689620815fc5mt.pdfIn PDF document text
    • http://fkpravo.ru/uk_theory_test_hazard_perception_pass_markikx52.pdfIn PDF document text
    • http://sumigemag.mywebcommunity.org/mivobe.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/4kUaqTF/kirexadexoxevidosisokeper.pdfIn PDF document text
    • https://cdn.sqhk.co/rijakobebux/dm5djcd/gopepiza.pdfIn PDF document text
    • http://smartline58.ru/how_to_clean_mitsubishi_heavy_industries_air_conditionersgcfb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_236da2fc764b4009a54924c6fcfe4f8d.pdf?index=trueIn PDF document text
    • http://bemuvarewu.onlinewebshop.net/cadena_de_suministro_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/gitoxewif.pdfIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_41f82eaf7eec414da561cb4c3348a691.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/63206608155.pdfIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_ca9aaf39ceec4ce888cc28a8d64243e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/41289256834.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/como_aprender_ingles_facil_para_nios_gratis.pdfIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_7002aa2e34874b4c90e15292fee6a0e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gogunabones/73634678309.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_off0000ed62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED62 5328 bytes
SHA-256: 53595312d58faee294cf9faf7db4d2d95cf3e5dd7d0e65525302f51bba4662d5
font_01_sfnt_off0000ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 10696 bytes
SHA-256: 57abd201319294ead8628006149ad4a190a71d205b7d8c8b2a7111971847cd92

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