Malicious PDF — malware analysis report

Static analysis result for SHA-256 f832244f76b2bef6…

MALICIOUS

PDF

77.1 KB Created: 2021-02-16 20:52:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: dfa06b5abde715e69e6908bc50f8588b SHA-1: a967f3f7dc5feba8bdf91d99d8fcec5000a5472c SHA-256: f832244f76b2bef6aa88a209261fc1954e53edc6c53c73f5ff39ce061722094f
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and redirecting to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=why+should+i+subscribe+to+someone+on+twitch In PDF document text
    • https://cdn.sqhk.co/noxibogalu/dgjVpjh/yellow_background_wallpaper_aesthetic.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/jghgihe/best_hashtags_for_tiktok_likes_and_followers.pdfIn PDF document text
    • http://seviregigaguz.22web.org/45855389649.pdfIn PDF document text
    • http://gvidilon.ru/matt_mercer_gunslinger_5eztsk1.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/UOPkJTq/xividage.pdfIn PDF document text
    • https://cdn.sqhk.co/vebiziwob/ctaAijv/best_spam_call_blocker_for_iphone_2019.pdfIn PDF document text
    • http://aazzzry.space/caderno_de_encargos_construo_civil3lhgq.pdfIn PDF document text
    • https://cdn.sqhk.co/suxupijisajo/ifijiam/video_promoter_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/ijSCxmj/pokemon_tcg_online_apk_2._68._0.pdfIn PDF document text
    • http://civiliscmq.online/45192020736gh2ny.pdfIn PDF document text
    • http://usmileofficial.site/bad_genius_sub_indo_1080pseij4.pdfIn PDF document text
    • http://littlenat.space/88842898923s5tjr.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/rSniaih/islands_in_the_stream_movie_review.pdfIn PDF document text
    • http://secureappeal.com/lamuvorinumebepjizr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gogolozumer.epizy.com/kagozogatalozotu.pdfIn PDF document text
    • http://bimuvugibane.rf.gd/platform_synonym_software.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_off0000f15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15F 5316 bytes
SHA-256: 2771bb8c498dedf2c7a8abe7370e15b82be2e54a01e45c62b1c79b05004efad2
font_01_sfnt_off00010360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10360 10412 bytes
SHA-256: e61704a115ef8e35f49db16616ef5d41e596e58ddbab48985533b39077cbcbff

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