Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a01c40caec41487…

MALICIOUS

PDF

75.5 KB Created: 2021-02-15 19:15:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1a2985dabc23c1933bc3d1e328068755 SHA-1: 35f24192dc2ebc294d498b0995b94a5604b51830 SHA-256: 1a01c40caec414876815626d53b5174acb012e10872ad3a68d0e9b70054cdec1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains a URL that mimics a search query for a popular online course, serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://maypoin.ru/wb?keyword=the%20complete%20machine%20learning%20course%20with%20python%20udemy PDF link annotation
    • https://cdn.sqhk.co/roratumopiv/h3jiMjd/ikea_hours_today_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/ji70agd/jujexon.pdfIn PDF document text
    • https://cdn.sqhk.co/nedevupoj/jjSgi9W/color_to_do_lists_tasks_reminders_windows_10.pdfIn PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/nolivozazenodi.pdfIn PDF document text
    • http://avtoshtorki.shop/nabixumizepow684r.pdfIn PDF document text
    • https://sagedawigaput.weebly.com/uploads/1/3/4/3/134336778/4ea7bd.pdfIn PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/jakoximawot.pdfIn PDF document text
    • https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/lepepufuwuto_mubaniz.pdfIn PDF document text
    • http://myfavoritesun.xyz/41558613265oxb70.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/jdjfjfo/moduli.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/tfujidr/bejigexuzasilexafefoz.pdfIn PDF document text
    • http://jotelefaxomawut.22web.org/talelevodemetakosirowod.pdfIn PDF document text
    • http://metalllift.ru/c_graphics.h_tutorialevj0u.pdfIn PDF document text
    • http://tazogupiwelul.iblogger.org/the_message_full_movie_bangla_dubbing.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/ddvibgi/president_debate_2020_dates.pdfIn PDF document text
    • https://cdn.sqhk.co/ninafoso/jeEYmha/26802501841.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bemuvubovewe.epizy.com/96929206872.pdfIn PDF document text
    • http://dominomufu.rf.gd/video_manager_for_windows_10.pdfIn PDF document text
    • http://zafuriket.rf.gd/95777132968.pdfIn PDF document text
    • http://kiluwemu.rf.gd/wixizaxawuxutup.pdfIn PDF document text
    • http://tojopoxirer.rf.gd/51538943963.pdfIn PDF document text
    • http://sudebesiku.epizy.com/wasakajug.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_off0000e76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76F 5632 bytes
SHA-256: 49a51144a579821e15b93b1f40bdc425be3d39c54907905ee52723ee8b8a15b0
font_01_sfnt_off0000fa7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 11020 bytes
SHA-256: e30db8c15e2ba29be4264877aaefb372290e3b7bc64ce2ee259c92faa26093cf

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