Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad374c078f275fd…

MALICIOUS

PDF

72.1 KB Created: 2021-02-15 17:29:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b9e9d3d7984d7a82a71a49fc4cdfd630 SHA-1: 8ab955a40b702a0806bd8c94c8d3be5d1408c485 SHA-256: 5ad374c078f275fdc0044bd150f7951e87c0e8f87079da8b6d3947845417b92e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains and link farms, indicating a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution attempt. While no scripts were explicitly extracted, the structure and URL patterns are consistent with PDF-based malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=shell+shockers+io+cool+math+games PDF link annotation
    • https://cdn.sqhk.co/rukokota/7gFf0g1/bidegifofe.pdfIn PDF document text
    • https://jenamojid.weebly.com/uploads/1/3/1/0/131070605/2742351.pdfIn PDF document text
    • https://xunipemadigorof.weebly.com/uploads/1/3/0/8/130813553/6985194.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/hjkzNgf/top_eleven_football_manager_2020_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/degixodip/YiiigyM/survival_island_hack_game_download.pdfIn PDF document text
    • https://woxudozu.weebly.com/uploads/1/3/6/0/136042517/5878776.pdfIn PDF document text
    • https://pibubeje.weebly.com/uploads/1/3/4/3/134374065/kuwukipavunekev.pdfIn PDF document text
    • https://cdn.sqhk.co/vixonafom/3bXJjjB/bendy_hello_neighbor_song.pdfIn PDF document text
    • https://cdn.sqhk.co/benanejufa/ghbmMwz/correct_score_betting_tips_telegram.pdfIn PDF document text
    • https://rejukikigukaw.weebly.com/uploads/1/3/5/3/135387704/torajorusi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xoxejafomi.rf.gd/stab_wound_autopsy_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/haryana_yamunanagar_today_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/double_entry_bookkeeping_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/panidapob.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/bks_krediti_informativni_izraun.pdfIn PDF document text
    • http://kojomazudogog.epizy.com/cessna_172n_maintenance_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/afrikaans_short_story.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_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 5380 bytes
SHA-256: 1decae63196771d816a6846f293567cdbc651aa183e52d5b10b7302d7cf9d4dd
font_01_sfnt_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 10792 bytes
SHA-256: 93c3e3b8b0a8959195a652d192e47be03ae11eb33457eab482510add531151df

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