Malicious PDF — malware analysis report

Static analysis result for SHA-256 be49db25ebb0f8cd…

MALICIOUS

PDF

71.0 KB Created: 2021-03-21 21:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bfb68329c427b50e94daf7079709b806 SHA-1: 9a4ae739bcc6b3edde7eba4acea596bf59406674 SHA-256: be49db25ebb0f8cd50c3241718df00eaacb80ad1b60d2ebf4f7e5e0de8b954c1
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://golowaki.ru/strik?utm_term=tales+of+a+fourth+grade+nothing+chapter+10+audio PDF link annotation
    • http://dezlice.ru/xomazokaxogwamwt.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/69839648572.pdfIn PDF document text
    • https://pugewolusaw.weebly.com/uploads/1/3/1/4/131453132/7983406.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449184/normal_6030a5b5ef893.pdfIn PDF document text
    • http://tagoturuluro.medianewsonline.com/cantril_ladder_scale.pdfIn PDF document text
    • http://seomagnat1.online/the_white_tiger_film_endingm7d40.pdfIn PDF document text
    • http://xivobivivupe.mygamesonline.org/vofovuwubavoboxanod.pdfIn PDF document text
    • https://fojumotapikapig.weebly.com/uploads/1/3/4/3/134372119/550f94a25c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_602ee81e8c4b8.pdfIn PDF document text
    • http://beststudent.space/godojorupoxuwaviz74ivv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe923b02-ea72-4d70-a0ca-7bf566e8a06c/why_is_man_in_the_high_castle_ending.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69708b4a-f985-4edc-a3db-1df498247979/lozusoduzawusabid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/759b746b-73bf-4310-9879-ca632d932d8a/labujexajid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64c19da2-be23-4ef8-8f8a-28238836af6a/reletikokewuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf420206-d057-4a30-b63f-e5742cf62d23/python_3_books_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffbc3795-7aac-40f3-bdc1-319f303df352/how_to_log_into_my_samsung_cloud_account.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_off0000d7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DE 5560 bytes
SHA-256: 113b9b265da38411932d1b806597f91ae3360df61375aabcf4b63f013c61b403
font_01_sfnt_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 10644 bytes
SHA-256: 01e1a1cc2dfcabe58ace26ee1e168b7b04954e736c31295ea333bca3bc245665

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