Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53c89ebdb775c9b…

MALICIOUS

PDF

76.2 KB Created: 2021-02-15 13:49:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 852b9779461c01be81e884742d707c20 SHA-1: 4e8a638bd6ef09bd0937260b200cf54a0256bca8 SHA-256: c53c89ebdb775c9b346edb9cdcfdc9bc82ab9c5c94777854ee911933f3bbcfaf
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-themed, suggesting a link farm or spamming operation. The primary URL points to a search result page for an appliance manual, which is likely a lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://leonvi.ru/wix?keyword=haier+portable+air+conditioner+hprb08xcm+manual
    • https://bokenupipanedi.weebly.com/uploads/1/3/1/4/131483400/mugubipogulusor-tixuxesujox.pdf
    • https://lupawepenotude.weebly.com/uploads/1/3/1/6/131606523/5119821.pdf
    • https://zinurutiman.weebly.com/uploads/1/3/5/2/135295757/kimozozorebi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rodiligarexo/whamisa_organic_flowers_hydrogel_sheet_mask.pdf
    • https://s3.amazonaws.com/lusegokaves/reformas_borbonicas_portal_cch.pdf
    • https://s3.amazonaws.com/xufaxoferugod/57024067024.pdf
    • https://s3.amazonaws.com/mexavofezoxi/49563769495.pdf
    • https://s3.amazonaws.com/wovugi/thematic_apperception_test_images.pdf
    • https://s3.amazonaws.com/gofiguj/gadolinium_pregnancy_guidelines.pdf
    • https://s3.amazonaws.com/jojitagifuva/beginners_guide_to_tarot_juliet_sharman-_burke.pdf
    • https://s3.amazonaws.com/gumagabu/blade_and_soul_slow.pdf
    • http://pexarazeju.rf.gd/refitilewilobolixinatad.pdf
    • https://s3.amazonaws.com/mulerux/balgandharva_full_movie_utorrent.pdf
    • http://kezijewuzal.epizy.com/37834535218.pdf
    • https://s3.amazonaws.com/dowadotiju/bovuzobabadaxiluzutoz.pdf
    • http://bitesokilok.epizy.com/82067650192.pdf
    • https://s3.amazonaws.com/vogubivajavofu/70252247292.pdf
    • https://s3.amazonaws.com/purawuma/application_writing_format_in_marathi.pdf
    • https://s3.amazonaws.com/lanubili/information_architecture_template_omnigraffle.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_off0000ec59.bin
67206902bcb4b1396797af9ebbc5160909f15387298ef349c2abc0be5a67d343
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC59 5640 bytes
font_01_sfnt_off0000ff55.bin
5459f2f60b83057987218670705a21b8f6f39954d86083a53488d38909d09bb2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 10412 bytes