Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54dee8187bdcbd0…

MALICIOUS

PDF

69.9 KB Created: 2020-12-10 05:29:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 33dd8c14f9401c53df9f6b690d3278d7 SHA-1: 2d169daea5307e49761ed880ecad93d50944b010 SHA-256: d54dee8187bdcbd026556d6958e7f0f36a046e33150db1179d7477c1f32d404e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to a link farm. One prominent URL, 'https://trafffe.ru/strik?utm_term=types+of+supporting+details', is directly embedded and likely serves as the primary lure. ClamAV also detected this as 'Pdf.Phishing.Trojan', indicating a phishing or malicious intent. No scripts were extracted, but the structure suggests a phishing or traffic-generation scheme.

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 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.
  • 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://trafffe.ru/strik?utm_term=types+of+supporting+details PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403936/normal_5f9254fd128a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413701/normal_5f95f1ba59ffc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427793/normal_5f9a140f8d5e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500692/normal_5fb347cd2d303.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/fibawubaxavuvabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425772/normal_5fad63c878f2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc1983ee2fce462bc90e0df/t/5fd1762d5e090321caa94d54/1607562810097/big_fighting_game_tournaments.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/141ff0ac-adce-4f03-b478-a00b70f03403/zosegupo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dda31452f90b7fe53205/t/5fc4e0c118e72e5fdb71734c/1606738114100/gisajibajurolo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4da1c2bbd7406581fdd5e/t/5fc6ef31a3696915e216f001/1606872886822/nba_bubble_start_date_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3e0aef9866f3fd2e6cd3c/t/5fc575623c02f22b9dc5afb0/1606776165205/vosota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c672c272-0fd6-4f41-8dd8-432d6a461470/69481782663.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf48cea97599144eed5c59/1606371535016/guwavola.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe20fe64571256540336aa/1606295813108/46283300506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ee4aeb2-7c41-4526-8bb1-aa986b0cf427/nugut.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc386dd1c8c7413144296be/t/5fc7da390a80c24503e139e0/1606933052655/texas_longhorns_basketball_roster_2009.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_off0000d17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17A 5260 bytes
SHA-256: 0c71714b7be3c26005e46018f08d235cf78311125a79c558ea77c545132cbc12
font_01_sfnt_off0000e378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE378 11484 bytes
SHA-256: 9213c0da0c1386eb48498922d0b0af71b756f6f8a1e4fcd8ec5c832becc75fb0

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