Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef80ca10506695b…

MALICIOUS

PDF

76.1 KB Created: 2021-04-02 00:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 90710405c7bddaec587d77d379d926e5 SHA-1: c93dca84e1f73eb11ba9e4341ca8fbd7f6ac3bc5 SHA-256: 8ef80ca10506695b06df228a8e8d9c2f212d591ea10c4abd40f26fb21925f9bf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The document body, though truncated, suggests a lure related to fixing controller buttons, directing users to a URL on 'golowaki.ru'. This indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=how+to+fix+controller+buttons+not+working PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4472776/normal_5fcd0a84252cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482671/normal_60559f8a2a7aa.pdfIn PDF document text
    • http://leririv.sportsontheweb.net/dekepifoxe.pdfIn PDF document text
    • http://sayfelengs.space/751359642294me02.pdfIn PDF document text
    • http://chambre.xyz/poulan_pro_pp4218avx_carburetorapxgr.pdfIn PDF document text
    • http://dazolovegom.mygamesonline.org/zowomuk.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/duwugewimajivizob.pdfIn PDF document text
    • http://itanto.space/12649066454k0p9e.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/wefemabeni/all_fortnite_skins_list_pro_game_guides.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/49374151482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/657690af-4a4c-4e95-82f6-fd3cd3ae46c9/gazadanigejamiziwopogusux.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/less_than_zero_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d394f1b-e448-4d41-bd23-c9aa9a10f241/adobe_acrobat_9_pro_free_download_full_version_with_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96a960b4-3160-46b6-869b-64fbef272875/premarital_counseling_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da627057-abd1-4071-9c6d-7173317d4cb4/25640688728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ba75621-b2bb-4e24-a159-2bd6df85b0ae/why_is_my_element_tv_screen_black.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba1bf48a-d418-4070-a2b4-e2f16cff7739/who_is_the_most_poorest_person_in_the_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e36582b-55cc-40cd-b88a-08137f1e8227/data_structures_in_c_notes.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_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 5164 bytes
SHA-256: d3c1a012e4aa2d5387764cc8350f073cbeb0318841acd40fcb0b77336bdd26c1
font_01_sfnt_off000100da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DA 10104 bytes
SHA-256: 530ce9556e3a97823264de7d496197c706293def8ef51de509f3a175a296aa66

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