Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e114eedbf729442…

MALICIOUS

PDF

75.1 KB Created: 2021-01-17 03:46:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5fd02b7dfc691e98737e28b9f440f71f SHA-1: b7361e50b0f1eed2784d531c969e18f12be4e874 SHA-256: 3e114eedbf7294425bb1cf7ee1d45dccbbbfb25729257c2128b341fd0748b9a9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

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://traffking.ru/123?utm_term=sketchup+make+vs+pro+2018 PDF link annotation
    • https://jezitazosebizag.weebly.com/uploads/1/3/4/7/134700096/kuwituz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_5f9012c2dd281.pdfIn PDF document text
    • https://tedomidile.weebly.com/uploads/1/3/2/7/132712102/lukak_xuvovo_temekobezowu.pdfIn PDF document text
    • https://vilewufatavak.weebly.com/uploads/1/3/4/5/134585542/kifamojekenaduno.pdfIn PDF document text
    • https://vazanopika.weebly.com/uploads/1/3/4/8/134896022/b508130997787d4.pdfIn PDF document text
    • https://site-1195328.mozfiles.com/files/1195328/jennifer_lopez_sister_news_reporter.pdfIn PDF document text
    • https://sutukukibefatu.weebly.com/uploads/1/3/4/4/134486522/nubiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_5f8b1eadbf359.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/Ovgfdhg/sazuzinodipagugapo.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/sudevejerifu/white_subway_tile_backsplash_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/maturibujo.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/authoritarian_form_of_government_definition_ap_gov.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_off0000e78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78E 5888 bytes
SHA-256: f921501fa00fe2ddb41d86244c5da684e235801c443cd2b7ab157f9e3f37f183
font_01_sfnt_off0000fb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB78 10680 bytes
SHA-256: 6ab4510a79f7623a2d2fa31fa2b45ef01a3a3ff7b1afd563c23de7179f4eea9a

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