Malicious PDF — malware analysis report

Static analysis result for SHA-256 644a85dc548a6429…

MALICIOUS

PDF

78.2 KB Created: 2021-03-27 17:14:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9f521a1b1dee571299d8f99706c87201 SHA-1: a828323ff04974c557225116a730ca5aa8a6c999 SHA-256: 644a85dc548a642951c14da544ff95acdf8c6529b675ad97ea641a47bbcc2d65
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://pelibifir.ru/strik?utm_term=what+do+the+colored+jelly+bracelets+mean PDF link annotation
    • http://dikagowoxi.sportsontheweb.net/36978864497.pdfIn PDF document text
    • http://hisgohar.site/read_the_bible_in_a_year_planner44jd1.pdfIn PDF document text
    • http://daimontimur.org/avg_antivirus_pro_cracked_apk_2018hr92w.pdfIn PDF document text
    • http://disconto50.pro/upkar_full_movie_720pqr79i.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/2011_jeep_grand_cherokee_repair_manual.pdfIn PDF document text
    • http://kozlo.space/65329633928uxe1m.pdfIn PDF document text
    • http://atelier-spb.com/john_deere_js63_mower_for_salewlpfo.pdfIn PDF document text
    • http://jusojixanona.getenjoyment.net/solorivapelozezugade.pdfIn PDF document text
    • http://baderezu.scienceontheweb.net/ratoxebogulabuzukavavoja.pdfIn PDF document text
    • http://gowisogodedugu.22web.org/62250408362.pdfIn PDF document text
    • http://zoom-omsk.ru/15085916821gr7ek.pdfIn PDF document text
    • http://plusstore.pro/watajukaxajuravl4oz.pdfIn PDF document text
    • http://1xbets-regs.site/the_queen_of_attolia_series1hdix.pdfIn PDF document text
    • http://copyright-services-us.com/aircare_humidifier_instructions7klh8.pdfIn PDF document text
    • http://dipugipedanam.sportsontheweb.net/love_story_english.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/e177e061-51e1-47c6-91f4-c81cabf59b89/1973130560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/939d1941-4529-4c3f-a955-59bdbe0b3a92/54547314333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db076503-8435-4c3a-9086-9e19ef9fb6be/58657285399.pdfIn PDF document text
    • http://gadusevi.rf.gd/75987714780.pdfIn PDF document text
    • http://bavufupuvamopaf.atwebpages.com/story_of_my_life_helen_keller_book.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/47186832778.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_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 5508 bytes
SHA-256: 6984191714256199d6e2f7fbb9c6707aae72fcaad444c4f3636b740fb2a22119
font_01_sfnt_off0001062d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062D 10764 bytes
SHA-256: 25aee3e50fd695f19d99ca9f698cc6a12ea58ea163de0692d36e4a488469f411

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