Malicious PDF — malware analysis report

Static analysis result for SHA-256 876c43ebcf7b57cb…

MALICIOUS

PDF

68.5 KB Created: 2021-05-02 23:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5eab77890e61958691cdbf58094e05cb SHA-1: d869e99afc61e46e748e9619aea54338095ddf24 SHA-256: 876c43ebcf7b57cbd690e40181c4cff2eaf47a73538a4047a7575e25424d89ac
186 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 0.9956

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=ionic+bonding+worksheet PDF link annotation
    • https://cdn.sqhk.co/zujijivopuju/jcihjhe/live_football_scores_bbc_scotland.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/ibahgBG/tupunuxesovilitexemiwefol.pdfIn PDF document text
    • https://cdn.sqhk.co/lofesaxudiwo/ejcaeja/wizz_air_abu_dhabi_office_contact_number.pdfIn PDF document text
    • https://cdn.sqhk.co/lubigegek/LHgjgjb/us_air_force_uniforms_through_the_years.pdfIn PDF document text
    • https://cdn.sqhk.co/mudonisogub/dpjfHia/weather_forecast_for_the_weekend_in_cork.pdfIn PDF document text
    • https://cdn.sqhk.co/zativojor/jeCy2gi/solinumutanedik.pdfIn PDF document text
    • https://cdn.sqhk.co/nujusowidom/gdfggyl/poweramp_music_player_full_version_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vofonowul/bHieXjg/4732468948.pdfIn PDF document text
    • https://cdn.sqhk.co/xurilopotun/97haicF/41773636803.pdfIn PDF document text
    • https://cdn.sqhk.co/vezukefuza/TheyGhi/49394769979.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzokikili/rBjhahb/anime_stickers_pack_wastickerapps.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosudav/8hfzxqe/47432962882.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/ghfsOgi/boxavon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c06eed-7b8d-4275-912c-8fe2ff26e643/modidususosarad.pdfIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_74465604509644698fb0a751f51e6fbe.pdf?index=trueIn PDF document text
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_0734f39a3bf04cbda5916d3747d5b164.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wisuw/sheet_metal_circumference_ruler.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/sotesedos.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/61283361255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3494c3ad-5dd3-4d39-97fc-a1d641785907/burger_king_menu_prices_2020_deals.pdfIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_e50dacb9aa134cc5b0614f3b321c78f2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c292485-4bd0-4e76-994a-75679ea9754d/kevin_ward_yesmasters_scripts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5510d35a-2ee0-4a73-afe5-bb272ee2d5aa/97944849123.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/headliner_novinews_achievement_guide.pdfIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_340f0e8f51c34915a1871637212b861b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/jurufufedofigi.pdfIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_371b3be19f244e9682ad035ac39b363c.pdf?index=trueIn 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_off0000cfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA4 5192 bytes
SHA-256: d1a07fa7b703fb60e47b7342f16878d932d2d9f985929eb5480bb3d54ddde553
font_01_sfnt_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 10380 bytes
SHA-256: 044a8ca42a2bc898144b14f24352b31c8ee3b0fe43226c02ecd35f63a2e823a8