Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a114e1fef3db02a…

MALICIOUS

PDF

79.6 KB Created: 2021-03-03 05:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c2798a977afa9a1123a024ad8ebca93b SHA-1: ee61f8fa6588985a3236bfd478a4cd7b20ab0c60 SHA-256: 8a114e1fef3db02a3266b5ebe5cc94f3b2cfa5eb0e5a6dbe247a26de67057cd7
136 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits social engineering tactics indicative of ClickFix attacks. The document body, though heavily obfuscated, contains text related to deleting temporary internet files and mentions wkhtmltopdf, suggesting a lure to execute commands. The embedded URL `https://resalured.ru/wix?keyword=can+i+delete+temporary+internet+files+folder` likely serves as a command and control or download source for a secondary payload.

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/wix?keyword=can+i+delete+temporary+internet+files+folder PDF link annotation
    • http://roxedizusugu.mywebcommunity.org/which_sbi_credit_card_is_best_for_students.pdfIn PDF document text
    • http://malanefire.sportsontheweb.net/programming_basics_java.pdfIn PDF document text
    • http://zinuxuf.22web.org/business_card_templates_for_real_estate_agents.pdfIn PDF document text
    • http://zefujixa.mywebcommunity.org/annies_song_with_lyrics_john_denver_3d_beautiful.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/hdgcgha/xufokemeleremonuwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rogofideb.onlinewebshop.net/read_the_handmaids_tale_book.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/fiwowegatofufetukano.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/genie_model_7055_programming.pdfIn PDF document text
    • http://jofawapedoguw.rf.gd/88967180203.pdfIn PDF document text
    • http://pibekolovaxizon.epizy.com/math_venn_diagram_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/busap.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/raletu.pdfIn PDF document text
    • http://pemowepog.rf.gd/feropofusekikufavupitakut.pdfIn PDF document text
    • http://romuwoturifitam.epizy.com/retinopatia_hipertensiva_oftalmologia.pdfIn PDF document text
    • http://latuwukatagowa.epizy.com/unfreeze_equifax_credit_report_online.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/rikugo.pdfIn PDF document text
    • http://lanuseponozowut.rf.gd/52010728770.pdfIn PDF document text
    • http://bebovufuvuji.myartsonline.com/digemigosopadifamuxubija.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_off0000f52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52C 5196 bytes
SHA-256: d2461b223ed1bcf66e3ffb28e3758330ca0a16109af05fe9ec090ea8aa9674c9
font_01_sfnt_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 13108 bytes
SHA-256: efeae1f6a639277f7939ce5940794969ba4260c208ec7b3ad2e0a01fb9e1b6c0

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