Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6793f7ed93c9893…

MALICIOUS

PDF

91.8 KB Created: 2021-06-09 09:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5bacd3dd85a2b0923c25de6faf388c2b SHA-1: 0b09e657f4f4a2e938cecdb2ff9c69b930a99bd7 SHA-256: f6793f7ed93c98931cd4813fc87ab16efe9ff4e8e6d7340782174f1079e9ca33
194 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to educational materials ('Hsc english 2nd paper model question with answer'). The presence of numerous external links, many hosted on disposable domains, strongly indicates an attempt to drive traffic to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/pbw?utm_term=hsc+english+2nd+paper+model+question+with+answer PDF link annotation
    • https://sutukedepebovi.weebly.com/uploads/1/3/4/7/134753024/8080564.pdfIn PDF document text
    • https://wizudagusosok.weebly.com/uploads/1/3/5/3/135317744/7beb8327c9.pdfIn PDF document text
    • https://setibadumizokeg.weebly.com/uploads/1/3/4/8/134880372/xemabopikewejulew.pdfIn PDF document text
    • https://vuminuzatadabem.weebly.com/uploads/1/3/4/3/134311796/b8ff751b81264.pdfIn PDF document text
    • https://motonolezigit.weebly.com/uploads/1/3/2/8/132814123/fbee5.pdfIn PDF document text
    • https://porutopor.weebly.com/uploads/1/3/4/5/134515231/garet-bemegegokemoki-muwexabupeb-wisires.pdfIn PDF document text
    • https://wizaxonaguwaxi.weebly.com/uploads/1/3/4/3/134306690/morizomek_foxavasuder_fopak.pdfIn PDF document text
    • https://gadipofonikiw.weebly.com/uploads/1/3/4/3/134390141/jokod_busuverivajobo_jukerokurenagum_toguforitik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_601e6c5553ba6.pdfIn PDF document text
    • https://banavodix.weebly.com/uploads/1/3/4/6/134687022/mazifinijatokokovot.pdfIn PDF document text
    • https://xisagoruno.weebly.com/uploads/1/3/5/3/135332800/mukalaxa_vaverovigorogot_pepisebike_musodibojukivod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418001/normal_5fedc7dd0b1b4.pdfIn PDF document text
    • https://lodufifed.weebly.com/uploads/1/3/1/4/131411197/pezesasifemub.pdfIn PDF document text
    • https://fafexozoruxefok.weebly.com/uploads/1/3/4/5/134527426/lukidevuxifosig_jikugoxedex_xetuxex_pilogo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • http://niluputevi.pbworks.com/f/fonapi.pdfIn PDF document text
    • http://nigezid.pbworks.com/f/42297063644.pdfIn PDF document text
    • http://zipiwume.pbworks.com/f/kakujeda.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/f/elementary_statistics_3rd_edition_answer_key.pdfIn PDF document text
    • http://jijagenaneke.pbworks.com/w/file/fetch/144477039/veveruluka.pdfIn PDF document text
    • http://sagabum.pbworks.com/w/file/fetch/144545448/55664078169.pdfIn PDF document text
    • http://demopefo.pbworks.com/w/file/fetch/144527982/eset_nod32_username_and_password_eav.pdfIn PDF document text
    • http://mogulazedub.pbworks.com/w/file/fetch/144715629/tigowezonokuk.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 5796 bytes
SHA-256: 05e94e6aa8c54ef2821e370e44d78c52ba30a5d4751ea6ae2f003921670f96b1
font_01_sfnt_off00010ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE6 10184 bytes
SHA-256: bf72a927a5d6365a693490443e2b38fc443552fbc4a3364ac6bf6740cbcee075
font_02_sfnt_off00012a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A31 5436 bytes
SHA-256: ca13adfbb81f36fa68b806ca1b0675afbba3ebdeb58406e8332cbe48c8bdeef4
font_03_sfnt_off00013bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB3 10812 bytes
SHA-256: e63234cac6422c5c961fd56198479b2c8f7848d4ff9f19447a090656f6c16beb