Malicious PDF — malware analysis report

Static analysis result for SHA-256 638876bdc93175df…

MALICIOUS

PDF

85.0 KB Created: 2021-01-27 05:45:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 972b6b0400f3300b7fd7d4c60a962ebd SHA-1: 1da6e692f26b005ea364aa452cf002ab60b848a7 SHA-256: 638876bdc93175dfc3575c278a37face75fa6f2ebf5ac65a73b9f93743319d7b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malicious content distribution. The PDF contains a large number of external links, suggesting a link farm or redirection mechanism to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs indicate an attempt to direct users to harmful content, likely as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • 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://druttle.ru/123?utm_term=pokemon+sword+throat+spray PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421782/normal_5ffaa30c7f9d8.pdfIn PDF document text
    • http://kellys.space/easy_way_to_draw_a_baby_girlvamu7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481170/normal_5fd6d876af5ec.pdfIn PDF document text
    • http://kokilubowo.22web.org/lelozelepu.pdfIn PDF document text
    • http://allwoman.site/the_last_knife_fighter_real_namen14sg.pdfIn PDF document text
    • http://susobokilodos.iblogger.org/11342848006.pdfIn PDF document text
    • http://academic-club.ru/tugugemuboxisekozexelod5gc5.pdfIn PDF document text
    • http://mbfsopg.com/bowling_western_ave_chicago_shootingspf0a.pdfIn PDF document text
    • https://bogekivusuwi.weebly.com/uploads/1/3/4/6/134604255/3b38ba3ae9.pdfIn PDF document text
    • http://jajosez.iblogger.org/nemuze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nemafu/wubiz.pdfIn PDF document text
    • http://taleweja.epizy.com/adventures_in_babysitting_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/vikugifexomid.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/39207799828.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/very_well_king_saha_audio.pdfIn PDF document text
    • http://kegepedefaripi.epizy.com/96572569043.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/waltz_across_texas_violin_sheet_music.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 3760 bytes
SHA-256: 1db543cd74e209828fa05b86c4f800463fb5e863e37c17a1c0568bc5fb5998a2
font_01_sfnt_off0000eabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABD 5164 bytes
SHA-256: 9b5e75ddda2323481b426416f1b5d970b32d48fc641e3648492a64a690538c9f
font_02_sfnt_off0000fc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC27 10844 bytes
SHA-256: 0eb709abcabb3e260f3cd427941f4d2869a338cca48e674003b10d0380c14f69
font_03_sfnt_off0001214e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214E 16092 bytes
SHA-256: 55d5123ea2e30bb0b6c65147a9271c01f8e2f7536e5e1d4b1c7059638f0fddb0
font_04_sfnt_off00013603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13603 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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