Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10013849dd8429c…

MALICIOUS

PDF

75.6 KB Created: 2021-02-28 15:27:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2d524652bb9f34a362cafeca92595918 SHA-1: aa321bec7918dd25a9c1d4d8b6008b8fffdb389e SHA-256: a10013849dd8429cec69e452e5f05a89d004e6658bbe5b4a479ef449156cbd4a
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 domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains a search query related to World War 1 economics, which is likely a lure to disguise the malicious intent of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jacksth.ru/award?keyword=how+did+world+war+1+affect+europe+economically PDF link annotation
    • http://mebevevi.mywebcommunity.org/can_you_put_two_hotels_in_monopoly.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/the_innovators_dilemma_1997.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/5865523659.pdfIn PDF document text
    • http://kvrovk.xyz/how_often_transmission_fluid_changep2kw2.pdfIn PDF document text
    • https://turezizudowan.weebly.com/uploads/1/3/1/6/131606253/6013812.pdfIn PDF document text
    • https://jinoranimewaxop.weebly.com/uploads/1/3/4/5/134528513/pewatep-wojupusetov-sovudegum.pdfIn PDF document text
    • https://gazumewus.weebly.com/uploads/1/3/4/9/134901575/744153.pdfIn PDF document text
    • http://ezfix.asia/pretest_emergency_medicine_4th_editionpipnf.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/53552738443.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/51454657280.pdfIn PDF document text
    • http://originalhallyu.com/95913034155gn2n0.pdfIn PDF document text
    • http://salonhq.xyz/jump_force_tier_listy6nun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fatisake/aoe_hack_map.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/answer_sheet_template_microsoft_word.pdfIn PDF document text
    • http://zasidad.epizy.com/what_is_the_process_of_orientation.pdfIn PDF document text
    • http://xijewixevav.onlinewebshop.net/pikovavivimijegilegosaf.pdfIn PDF document text
    • http://gamukezaf.rf.gd/how_much_does_an_interior_designer_make_yearly.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/salebiniburugufif.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_off0000e9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A4 5328 bytes
SHA-256: 9f99cfc8e258b18b11d4bcc09665d4300f4d8ab717394c13975b84749b8168a5
font_01_sfnt_off0000fbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 10856 bytes
SHA-256: cde44429b638c690b0e25364ba5bbf98c07fa97b37203900ab61a7ac76807f79

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