Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcf250e6b6d45fe…

MALICIOUS

PDF

81.3 KB Created: 2021-03-20 02:09:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7c398d76cb6ff1289492b3e20f3e6f2d SHA-1: 7e2d5b7e1d3d590b67a781800c8a109f7d52b501 SHA-256: 8bcf250e6b6d45febbbaf593934ffa8db1d35990d728040e083f79b74a2c99f1
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and configured as link farms, strongly suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a specific search term, indicating it was likely generated to appear as a search result or informational document to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://vilenefex.ru/strik?utm_term=wgu+information+technology+degree+reddit PDF link annotation
    • http://baluninelekab.22web.org/59737143127.pdfIn PDF document text
    • http://weareanonymous.org/brother_day_2019_whatsapp_statusdz6l1.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/wayne_dyer_books_in_order8igli.pdfIn PDF document text
    • http://mamunetosi.iblogger.org/gadamoxejeji.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/why_mars_and_venus_collide_sinhala_translation.pdfIn PDF document text
    • http://fridgeservice.ru/59339054587yfr6g.pdfIn PDF document text
    • http://devgame.design/83488487250c40up.pdfIn PDF document text
    • http://ranomurivokav.22web.org/dogowukob.pdfIn PDF document text
    • http://sodalabs.club/suwubuxak31qx.pdfIn PDF document text
    • http://futuroke.iblogger.org/42505105233.pdfIn PDF document text
    • http://jijoxep.getenjoyment.net/figewiz.pdfIn PDF document text
    • http://getporte.xyz/lilo_and_stitch_amigurumi_free_patternfm5e0.pdfIn PDF document text
    • http://discovljzg.fun/pujitafuxejs482.pdfIn PDF document text
    • http://yozi.store/how_much_does_nasm_cpt_costasxfr.pdfIn PDF document text
    • http://nutosolawuxa.iblogger.org/62174416156.pdfIn PDF document text
    • http://world-wild-shop.com/physiology_linda_costanzoe9pug.pdfIn PDF document text
    • http://pixell.store/32_viral_video_ideas_for_busy_musiciansirov4.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/fewegepuxaxupiwiwirakuzezx15e.pdfIn PDF document text
    • http://newberginvestmentproperty.com/alphabet_letters_worksheets_free9m0yy.pdfIn PDF document text
    • http://sfhgfje5df.xyz/320333524eopfd.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/51020565493.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bememikat.onlinewebshop.net/42168506771.pdfIn PDF document text
    • http://bazofigi.epizy.com/56326072327.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 5252 bytes
SHA-256: 345e8c8e8e0098c48bd28f5af63f7b188ba682c7cf5e9a99561fe0a860abd041
font_01_sfnt_off00010455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10455 10944 bytes
SHA-256: 8a2cb62cdd372e56f3828643e2a1bd04dadd36d1ddbbc16b517249b5b04aece7
font_02_sfnt_off00012961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

Open this report in the interactive analyzer, or submit your own file for analysis.