Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a693307355cda77…

MALICIOUS

PDF

74.6 KB Created: 2021-02-20 06:32:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3e6d2a6dd01cdf78094293c27d3594e2 SHA-1: 8ce532b1a79987a9756fb37ea590bf298a0f605e SHA-256: 0a693307355cda772e24043e295b8ba3add0762e325fd6d4fb1898d13bbfb149
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 0.9998

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://druttle.ru/wix?keyword=poe+delve+guide+3.11 PDF link annotation
    • https://sefewazugep.weebly.com/uploads/1/3/5/2/135293251/8527913.pdfIn PDF document text
    • https://dakubotamijez.weebly.com/uploads/1/3/2/7/132712147/f8f2f4b85a40a4.pdfIn PDF document text
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/vibirirajesi-nedewiranuke-gogurixukotex-pibezarowumeraz.pdfIn PDF document text
    • https://linepofikoleku.weebly.com/uploads/1/3/4/4/134492010/tupegedoked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_6028251688c6d.pdfIn PDF document text
    • https://jeboxalu.weebly.com/uploads/1/3/0/9/130969965/pudit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454679/normal_6002025ed238b.pdfIn PDF document text
    • https://xovadodelemowuz.weebly.com/uploads/1/3/1/3/131383330/3652758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_6026cebcaf8aa.pdfIn PDF document text
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/gamurivovopezexabi.pdfIn PDF document text
    • https://medadafamu.weebly.com/uploads/1/3/0/7/130775854/bazevabunexesiretu.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/geradi/60717282919.pdfIn PDF document text
    • http://jirunogi.rf.gd/classic_wow_leveling_guide_map.pdfIn PDF document text
    • http://gaditerigasut.rf.gd/sesib.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/bejeweled_2_crack.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_off0000e8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 4816 bytes
SHA-256: 2356bfefb54188f119820f4f925fa14be5d3b00130b9932d4eaf40c13575b820
font_01_sfnt_off0000f97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97A 10480 bytes
SHA-256: 02f1eb44559f7c9ecd4f24d1b49b229cb175c8ffa9fc651f18f373817c26d152

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