Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca85d0ec04c3e56…

MALICIOUS

PDF

72.6 KB Created: 2021-04-04 06:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 288286b14aa08496c9568233a7e53b8f SHA-1: 9f068636e9cbe1d9da74a9fcc1a29c8d5dcd5dbf SHA-256: eca85d0ec04c3e560e28a46dfb7fb186cba8681ebe3c28090486083975381e11
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=boy+meets+girl+say+hello+to+courtship+pdf+download PDF link annotation
    • https://zuwasaroniw.weebly.com/uploads/1/3/1/3/131380739/7395802.pdfIn PDF document text
    • https://sutafufig.weebly.com/uploads/1/3/4/4/134402916/besejotobeme-nimonelomuzenu-bebatidulabad-nulotimukodi.pdfIn PDF document text
    • https://cdn.sqhk.co/xesozugis/cRi1tgd/92389408269.pdfIn PDF document text
    • https://rovorakule.weebly.com/uploads/1/3/4/7/134774255/8696395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466675/normal_5fd1d992ed406.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366389/normal_6009550600f52.pdfIn PDF document text
    • http://kijumubafenu.mypressonline.com/97905320480.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464521/normal_5fccbf3fe6e2d.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/fjbjhhi/60202975688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447265/normal_603536cee38ca.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/hf2gfjc/blackpink_magic_twist-_twister_tiles_kpop_games.pdfIn PDF document text
    • https://letavozogat.weebly.com/uploads/1/3/5/9/135978758/8528344.pdfIn PDF document text
    • https://zaxefuki.weebly.com/uploads/1/3/5/2/135299090/7631945.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/gdggBhh/didibonat.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/wfgcVeW/steven_universe_save_the_light_apk_mediaf_re.pdfIn PDF document text
    • http://xasekijig.mypressonline.com/characterization_of_lactic_acid_bacteria.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_605c296403658.pdfIn PDF document text
    • https://cdn.sqhk.co/zofagopipowi/XORJ8iL/jisaguposedetigupugul.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/OvIicgj/agricola_average_score.pdfIn PDF document text
    • http://vezukugijisepo.scienceontheweb.net/43793175081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401703/normal_5fd7a7abc9fe8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xijewixevav.onlinewebshop.net/kinikazokujawikon.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_off0000db27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB27 5812 bytes
SHA-256: f6c6d31bfa16f84dd9a9a7a85ed1d9803a67da634f1d4a0b080270ee2e1f013e
font_01_sfnt_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 10548 bytes
SHA-256: 993a1e71153579214e27aacc578b5b18571c6f0d8b65afe7b35f12364f9a4f5a

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