Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a292ba482dd097…

MALICIOUS

PDF

97.0 KB Created: 2021-04-06 04:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5021ea7bd859c356958c780de2d1a18 SHA-1: da811028aa193ac2997be8cd6cc2d116c94402b1 SHA-256: f7a292ba482dd0974a6a7f2fbc220bc1caf73d943344a1a714ddda4db19e2df6
176 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and a phishing attempt. The 'SE_CALLBACK_LURE' heuristic specifically indicates a callback phishing pretext, likely aiming to trick the user into calling a fraudulent support number. While no scripts were directly extracted, the presence of numerous external URLs suggests a potential for further payload delivery or redirection, aligning with common phishing techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://midufefew.ru/wix?keyword=vodavi+telephone+manual
    • http://worldthailand.fun/what_is_the_complementary_strand_to_the_dna_sequence_tagtcamico6.pdf
    • https://cdn.sqhk.co/gapirofi/i1sidhh/dungeoneering_token_guide.pdf
    • https://cdn.sqhk.co/jigavozef/4ii1hfj/ios_14_lockscreen_aesthetic.pdf
    • https://cdn.sqhk.co/mofijovelu/dZsQmyB/survival_game_lost_island_3d_apk.pdf
    • http://yoganchik.space/841210557611maa4.pdf
    • https://cdn.sqhk.co/mivezifov/fjgiahV/basagapezopezojon.pdf
    • https://cdn.sqhk.co/wofunukasu/nyZhegh/3470132828.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wewuvizab.epizy.com/zombie_catchers_mod_android_1._com.pdf
    • http://regipikiwubadov.epizy.com/compliance_market_report.pdf
    • https://s3.amazonaws.com/jevedijadiki/engineering_drawing_and_design_seventh_edition.pdf
    • http://dodixuvizovov.epizy.com/caustic_3_android_skins.pdf
    • http://legumanob.rf.gd/porulovela.pdf
    • https://aaca6425-83b8-4992-a49d-2ec8a2d61848.filesusr.com/ugd/304e3c_856b05a4e2554c079a8c256f3abe9a4a.pdf?index=true
    • https://s3.amazonaws.com/gosete/netgear_wnr2000v5_password_reset.pdf
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_5e3b2da0e7de460dbed9a44ebd05101f.pdf?index=true
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_7dd85962a3eb4a4f85ec5cf4121b24af.pdf?index=true
    • http://modejaj.epizy.com/adding_algebraic_fractions.pdf
    • http://joliwudetikuzu.epizy.com/86389482069.pdf
    • https://s3.amazonaws.com/ganubatebedoxez/electrum_btc_wallet.pdf
    • http://navefifidarep.epizy.com/70957021010.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ea2.bin
da39d6981468afa34509cf700df2ebaac13ee8ef0ba33fb7d48cfdc2776c1e76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA2 4948 bytes
font_01_sfnt_off00014f5d.bin
2314b08d13c2474efa5a55b7e95ed73b33445fe2dc8788c5b716e3cd01538261		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5D 11592 bytes

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