Malicious PDF — malware analysis report

Static analysis result for SHA-256 48258d78d3b8bc9a…

MALICIOUS

PDF

123.5 KB Created: 2021-02-14 15:09:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e13430d4dcf79c30017281af9851af7c SHA-1: 37cb1b97bbeb135800244c6f24e6fe30eef4e4d5 SHA-256: 48258d78d3b8bc9a3faab75cfb103c7bb3ee446e25383d55ed56338b2b691d8c
156 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. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/aws?utm_term=android+canvas+fill+circle PDF link annotation
    • https://cdn.sqhk.co/narobalof/Hjhqgj0/titamubiwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402712/normal_601b28f380c14.pdfIn PDF document text
    • https://zefukigu.weebly.com/uploads/1/3/4/7/134718507/lolaj-duvufumibefev.pdfIn PDF document text
    • https://wakebanimoxebej.weebly.com/uploads/1/3/1/3/131383753/jamejalibonupi.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/BEgiiar/11223227223.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/ia3wjfY/ccm_ice_hockey_skates_size_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/bomikiwolug/jfhhgib/35318522053.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/icghuWf/zarapopefagelig.pdfIn PDF document text
    • https://cdn.sqhk.co/xaderimi/jjgiZCC/shareit_apk_old_version_for_iphone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lobosutu.epizy.com/pudekijudomasuz.pdfIn PDF document text
    • http://delixerilebuk.epizy.com/sixekef.pdfIn PDF document text
    • http://lusuzajemofim.rf.gd/79262251707.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_off0001a6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6C2 5064 bytes
SHA-256: c15cc1e7ad80ea14ee6ba63608d72e9849c178e667888c9c0db010956665b123
font_01_sfnt_off0001b814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B814 11844 bytes
SHA-256: b1a946d456b96316b3126475a1e516abba9b709b553d24d8aa108e62c0f61534