Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27e4945f8c36fbc…

MALICIOUS

PDF

87.6 KB Created: 2021-03-02 19:14:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92251e4fa6f41170d0e809fd834108b4 SHA-1: bcd41efcca7f18a6e355270e97f84b695b243cdf SHA-256: c27e4945f8c36fbc020c8e95d5f9cca9468504542919ab1eeb358ae2f53e36af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a mass external link farm and embedded URLs suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/123?utm_term=can+i+create+a+free+website+with+wordpress
    • https://cdn.sqhk.co/gavezexu/jggxgdV/10578357990.pdf
    • https://lijepaxo.weebly.com/uploads/1/3/5/3/135324298/dexozime_risoronepaporej_lejasez_fagir.pdf
    • https://cdn.sqhk.co/bupewazadufa/4EIjegg/history_channel_not_on_youtube_tv.pdf
    • https://cdn.sqhk.co/goseluna/ggnK8hc/wukapamiguwufozude.pdf
    • https://cdn.sqhk.co/tiwoxebu/UjgaDyp/95518473820.pdf
    • https://cdn.sqhk.co/tatidukigag/ibO0Ige/nikabexexer.pdf
    • https://baboxubawuxi.weebly.com/uploads/1/3/4/6/134666135/mowipavoxomudor-bofefexivom-gabel-neguje.pdf
    • https://static.s123-cdn-static.com/uploads/4456387/normal_6000c37d7817f.pdf
    • http://teaapple.space/what_is_the_main_problem_in_flora_and_ulyssesaaypq.pdf
    • https://reperitibomotij.weebly.com/uploads/1/3/1/3/131383541/9857014.pdf
    • https://cdn.sqhk.co/botonerepap/iibBm5h/wovitusipuzilimemegud.pdf
    • http://kukushpa.fun/can_obd_ii_scan_tool_u48095hzd.pdf
    • http://summer-italy.fun/how_much_is_a_fisher_wood_stove_worth19kkk.pdf
    • https://cdn.sqhk.co/belumozobu/hY9uhgw/40337444006.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00011ab2.bin
06d26fd93043a5daf5c55fa9af0a8cf2ceb4b36886b98a24f04277eb8e503584
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB2 5348 bytes
font_01_sfnt_off00012ce3.bin
a12eaf8b8d988171cb300e9844bb91c1f064305beb80ff1fea7e9b11cb2b6587
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE3 10564 bytes