Malicious PDF — malware analysis report

Static analysis result for SHA-256 828f93aaa1bde610…

MALICIOUS

PDF

90.9 KB Created: 2021-05-16 04:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce0dfd1db3fc0c773a3bd17976493892 SHA-1: bdb143a05f5771667a274dd7065443db28d9bbc9 SHA-256: 828f93aaa1bde610fca0dc7399d7a2e7b8d2e46f35d925a8a741b1b91eeb44c6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary one pointing to a suspicious domain associated with phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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://botokaw.ru/strik?utm_term=fender+fuse+mac+blocked+plugin
    • https://static.s123-cdn-static.com/uploads/4417212/normal_5ff8c465133f5.pdf
    • http://mosomupusafebin.medianewsonline.com/dulatafopufefivosawedunu.pdf
    • https://static.s123-cdn-static.com/uploads/4365626/normal_5ffd16c3adfdd.pdf
    • http://sotipidikukunow.getenjoyment.net/34163814145.pdf
    • https://cdn-cms.f-static.net/uploads/4402244/normal_60170f4532dbc.pdf
    • http://fomoregekamikat.mypressonline.com/anaphylaxis_action_plan.pdf
    • https://cdn.sqhk.co/duzixulok/hi4Oij2/spotify_for_wear_os_apk.pdf
    • http://xelasurugopu.mywebcommunity.org/waketosimoxisidazawuk.pdf
    • https://static.s123-cdn-static.com/uploads/4487007/normal_5fcacfc099b82.pdf
    • http://ita-talia.fun/cido_bromhdrico_formula_y_nomenclatural7bht.pdf
    • http://detonic-ro.website/vebufazizonakarukimu5q8cm.pdf
    • http://cosmostil.top/wejimukazujonivuxuwerzbp.pdf
    • http://rasixojolebasug.iblogger.org/ratalosakoma.pdf
    • https://cdn.sqhk.co/rijolumexeb/Fhiijcv/89791303204.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dipobitabi.rf.gd/worej.pdf
    • http://bigapenegig.atwebpages.com/advanced_java_programming_notes.pdf
    • http://lukafimagog.atwebpages.com/building_construction_by_pc_varghese.pdf
    • http://kijenor.epizy.com/muropubiwofup.pdf
    • http://tizepadeda.rf.gd/wefutisumus.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010259.bin
1b5fcde5eeba4039a590384b5ae218ff6dbfd7e855515eac1fe54f8aeb6d68ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 5636 bytes
font_01_sfnt_off00011561.bin
0e0259ac06b5e63c9fbbe0b63de04b6375a8b8a1b56afe9f0e4286666c95e82a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11561 2128 bytes
font_02_sfnt_off00011f30.bin
ec92afe8518e51dcbac3d37f6077d4841d68edbeb1a6a6f75c26888b1bbff35a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F30 11824 bytes
font_03_sfnt_off0001472f.bin
b118ad4a5f0f66e944d0a6e82a0dad6050c27e77cb1eabf64d07f40874ae21b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1472F 16080 bytes

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