Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab19823401f0e27…

MALICIOUS

PDF

78.7 KB Created: 2021-05-26 07:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 261ffa69c00fb132e304f84410354bef SHA-1: da9b7c59985941c78267947563b84c5f4edfc6bd SHA-256: cab19823401f0e27769d6bb73720de5ee5f7fb9cdb7f791564d05fdf6a661b6a
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://dugedepap.ru/strik?utm_term=how+to+cheat+in+aleks+math PDF link annotation
    • https://giromazipudu.weebly.com/uploads/1/3/1/4/131453901/6190549.pdfIn PDF document text
    • https://xusemiwo.weebly.com/uploads/1/3/4/8/134899199/vexifeba_tixobedid_wavikugetisoto.pdfIn PDF document text
    • https://kezikiwagoxarud.weebly.com/uploads/1/3/0/7/130739267/8fcd9.pdfIn PDF document text
    • https://gusotefatimadi.weebly.com/uploads/1/3/1/6/131636747/safaxififixik-pumexitujebewi.pdfIn PDF document text
    • https://wesobopaforok.weebly.com/uploads/1/3/5/3/135311180/3778946.pdfIn PDF document text
    • https://pujibotawajifuw.weebly.com/uploads/1/3/1/3/131379639/wenarigan_bafujopifew_vepowimugo_texudexovujin.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/2640174.pdfIn PDF document text
    • https://sewusadata.weebly.com/uploads/1/3/5/4/135401056/jepogawipi.pdfIn PDF document text
    • https://durupojivuzebip.weebly.com/uploads/1/3/1/8/131856887/xerubeba.pdfIn PDF document text
    • https://semulojera.weebly.com/uploads/1/3/2/6/132695334/1c3f676145d5f.pdfIn PDF document text
    • https://zuvopiramalatug.weebly.com/uploads/1/3/5/9/135981479/tetagabij-zexosiredodej-depapelupetip-fukujofitenexug.pdfIn PDF document text
    • https://mafakovik.weebly.com/uploads/1/3/5/3/135347242/8586390.pdfIn PDF document text
    • https://pujonavow.weebly.com/uploads/1/3/5/9/135958036/jikat.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/fapaga/vogunuvefavawifegikal.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/zipekujisuvexazevatad.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/can_a_two_year_old_play_with_playdough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5f82ce1-c245-4145-96f8-236582ef58c5/xodonawagulutozazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8072d72-d4cf-464f-a5a0-68524466083a/822422622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a73b2ff-1708-4b5b-aeda-17e058943441/gitotozixebagexisujutezus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159d5ac1-1fa9-4a04-9228-c3ce98abd59b/duwasi.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_off0000f317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 5060 bytes
SHA-256: f632b9aa328e0d239fa0c5abd30f75e8be4f7dc2c4baf6c91a2a60461d93f346
font_01_sfnt_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 11832 bytes
SHA-256: e1a3784398f92a6c2b7ba4a77c8fa4eb42a34d36de8f0fd9b14e241966b6811a

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