Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb5d7b7db4aadd0…

MALICIOUS

PDF

83.3 KB Created: 2021-03-04 05:22:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f72e907160151816758e75f47c46d5ae SHA-1: 318562675ce6b64cf8e92898e030af1253990342 SHA-256: 6fb5d7b7db4aadd08c911a2950c3ed35a0d019daf9f253da984edc5ca0c3102a
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-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://kuzutuzo.ru/wix?keyword=apush+period+5+dbq PDF link annotation
    • https://gorofegi.weebly.com/uploads/1/3/4/4/134462705/vogixeb.pdfIn PDF document text
    • https://bugojexipu.weebly.com/uploads/1/3/1/3/131398417/4985941.pdfIn PDF document text
    • https://zidajikivumab.weebly.com/uploads/1/3/4/6/134625594/468649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447497/normal_601ee3b7ae61b.pdfIn PDF document text
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/tuleki-lumemanad.pdfIn PDF document text
    • https://mirijanonukuzo.weebly.com/uploads/1/3/2/7/132740352/76369e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451945/normal_5fd64cd2a6dc9.pdfIn PDF document text
    • http://dovazevenujo.22web.org/second_hand_law_textbooks_australia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483388/normal_6000b4039486e.pdfIn PDF document text
    • https://sirewuri.weebly.com/uploads/1/3/5/2/135298631/laduditegip_bomepuxaxa_jijagavixefopu_tibulub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://popadugabi.rf.gd/descriptive_essay_for_grade_7.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/72892243536.pdfIn PDF document text
    • http://lepejifilafimif.rf.gd/ludalesis.pdfIn PDF document text
    • http://xuxusemo.epizy.com/how_to_draw_manga_female_body_anatomy.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/how_to_get_rid_of_knee_pain_while_sleeping.pdfIn PDF document text
    • http://muwadobekele.rf.gd/68225968542.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/29925130801.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59B 5184 bytes
SHA-256: 96addd5d90307bc5d084948e089e57e6118e8e01c4b31e06e47d8f4aee48d4af
font_01_sfnt_off00010729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 2568 bytes
SHA-256: 65875c7c6a2324827d8144190bb7b53c9eecb1d330e3240c4963a0facc0564a5
font_02_sfnt_off00011254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11254 14648 bytes
SHA-256: 948a7250fd7ad2bf653bdc886c0da2ce7fe77511af5139fc98f7fc497db584fc

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