Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37616fc8a5b785f…

MALICIOUS

PDF

80.4 KB Created: 2021-03-08 15:32:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2d93f0adb8935f774c2c6e34cd46a285 SHA-1: a010f1dca87037e543e4fcd471fd5ffab4bf840b SHA-256: d37616fc8a5b785fae60ac60f7293147e66e04acca056701cacf7a5238866c80
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or SEO spamming attempt. One prominent link, 'https://crophysi.ru/award?keyword=basic+concepts+of+stock+market+pdf', is presented as a search result, likely to trick users into clicking it. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links supports a malicious intent, possibly to redirect users to phishing or malware-distributing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://crophysi.ru/award?keyword=basic+concepts+of+stock+market+pdf PDF link annotation
    • https://cdn.sqhk.co/wakewafo/70gd5no/92220127025.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/midjbX6/cat_heating_blanket.pdfIn PDF document text
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/3db767f0fbed.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/MKggQot/tepawokotokofubavilepum.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/gfRlv3L/grumpy_cat_died_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/jabezoxujo/icRshhT/zumekiwabateba.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/FadXBhc/wii_homebrew_gamecube_controller.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/Hhdjhhm/world_chef_association_logo.pdfIn PDF document text
    • https://cdn.sqhk.co/roxirali/lhejcji/horse_racing_manager_2019_mod_apk_7._03.pdfIn PDF document text
    • https://felojabok.weebly.com/uploads/1/3/0/7/130739263/12046d2e.pdfIn PDF document text
    • https://cdn.sqhk.co/pajijolabalu/bgfVqij/32284531481.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/Xjgiahi/13010037124.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/jMjiQhg/soccer_heads_premier_league_weebly.pdfIn PDF document text
    • https://cdn.sqhk.co/sururezog/ovKdihH/retasajokosav.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/ggiXVjj/34189089952.pdfIn PDF document text
    • https://cdn.sqhk.co/tiluzegata/4f4gcji/snowboard_party_world_tour_pro_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/free_funeral_program_template_2010.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/16349209117.pdfIn PDF document text
    • http://kafopazam.epizy.com/16532101737.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/wimumepibowoxijopozo.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/vufovowijemifivifiliwo.pdfIn PDF document text
    • http://pujusojup.epizy.com/28851802642.pdfIn PDF document text
    • http://manutilo.epizy.com/project_management_organogram_template.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 5380 bytes
SHA-256: 786385adee9199c7800d7d9eb99e8a0d03eafee1e726294fa1554825dcd5320d
font_01_sfnt_off00011097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11097 10428 bytes
SHA-256: 63d754353aca99593be679e28a1c2356d6bbc7074d08588e67713fcfd1dade0b

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