Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f397b246188439…

MALICIOUS

PDF

76.9 KB Created: 2021-02-24 07:56:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8d188c9b4f33afbab72dc2980d0af17f SHA-1: 16953493a1683295b8b1fd358b86a2e64edfdb3d SHA-256: 85f397b246188439b5cd53f3e8febe86e1650f725d5e6121eefe83a30d0604a2
126 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 5

  • 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 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://jacksth.ru/strik?utm_term=what+does+an+officiant+say+at+a+commitment+ceremony PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501514/normal_5fcb70b873023.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455914/normal_5fde330c42f1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468536/normal_5fd66f7c65f97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470029/normal_5fed543eab2db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480897/normal_602adc4b887d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_60247d96cfb76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498971/normal_602cf50009d3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_601199b96d50f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428069/normal_6029a7f31d238.pdfIn PDF document text
    • https://cdn.sqhk.co/mebereserab/ehhahas/41710151712.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://varidigodi.epizy.com/yahoo_search_app.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/gugibopalowolimupini.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/in_play_store_pending_is_coming.pdfIn PDF document text
    • http://dusetelonuzaj.epizy.com/18556591548.pdfIn PDF document text
    • http://puzegekizizovin.epizy.com/answers_to_ishihara_color_blindness_test.pdfIn PDF document text
    • http://tozopovudot.epizy.com/kadamban_all_video_song.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_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 5344 bytes
SHA-256: baee2ac25f1946ce6f4ad3f547d2c59e90718bc0e3f63b3301543fe9bf8e81b3
font_01_sfnt_off0001022d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022D 10616 bytes
SHA-256: 01bc3c303ebc9d1214bc0046d8f57ce0a24d8bcbcd7f15d70571b1bc5dac277c

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