Malicious PDF — malware analysis report

Static analysis result for SHA-256 1286fe2908d42686…

MALICIOUS

PDF

71.7 KB Created: 2021-02-21 16:56:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: a16a52652528adf321ca2915fb4eae4a SHA-1: f0509f6c3b67af759ff282f0f978be89741e8a53 SHA-256: 1286fe2908d426863393597e413ce20a27d1eb41c9ad56b458d9c1842945e467
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to known malicious redirectors or disposable hosting. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to 'yafferge.ru' as malicious. The document body, though heavily obfuscated, suggests a lure related to 'vocabulary workshop', which is likely a pretext to encourage users to click the malicious links.

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
  • 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=vocabulary+workshop+level+d+unit+5+answers+synonyms In PDF document text
    • https://lexedixejorew.weebly.com/uploads/1/3/1/4/131438453/levowevonorowu-delekaxesubo-jafifupidori-sufus.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/NjgAhcn/domaka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463308/normal_600eaa3942021.pdfIn PDF document text
    • https://zitupakunetod.weebly.com/uploads/1/3/0/7/130739751/7343417.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/nesawopusekovuxh5nx.pdfIn PDF document text
    • http://itrom.fun/berajoziginovamabowaludoinmr8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367645/normal_5ff2492c39c2b.pdfIn PDF document text
    • https://titapogesasoja.weebly.com/uploads/1/3/1/3/131380181/7201036.pdfIn PDF document text
    • https://kogofidovobe.weebly.com/uploads/1/3/1/8/131871531/xijoxuzimuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479222/normal_6022d8851390d.pdfIn PDF document text
    • http://zoosalon.org/salems_lot_2004_online_subtitrat5roy4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409827/normal_600fe6db0029a.pdfIn PDF document text
    • https://cdn.sqhk.co/naxenunovus/alxgegi/team_bc_hockey_u16_roster.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/company_of_heroes_2_us_forces_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/21653843099.pdfIn PDF document text
    • http://molutuganum.epizy.com/wosit.pdfIn PDF document text
    • http://vibosaxijus.rf.gd/73853404079.pdfIn PDF document text
    • http://fuxunefilat.epizy.com/autumn_leaves_chord_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/flower_coloring_sheets_for_preschoolers.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/39403557712.pdfIn PDF document text
    • http://sokevigaku.rf.gd/debussy_preludes_book_1_sheet_music.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_off0000da1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1D 5860 bytes
SHA-256: 979c5cf61324861df26ab9fc4601f1bcf339a3cff6172315262540af28cf1104
font_01_sfnt_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 10296 bytes
SHA-256: cba158e4d62e7b09ea8f1829acadcd923123dd4373d98d89b6a1d70fd4124eae

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