Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2191fa4eff47cf…

MALICIOUS

PDF

75.7 KB Created: 2021-03-20 15:03:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3ebe0532662183e328b030a512772cfe SHA-1: fc5efa33c2d8b6f064c75ee52be5522b5ba7fe0b SHA-256: 8c2191fa4eff47cfe785fd7472611deaaa558570667835443c4fa9455db020a0
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 0.9997

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://zajinet.ru/award?keyword=best+android+app+to+convert+pdf+to+word PDF link annotation
    • https://cdn.sqhk.co/xubupigegi/idhdChh/road_rage_epic_shooting_dallas.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/icnCYZx/bunny_running_around_feet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427509/normal_5febd4080bf9e.pdfIn PDF document text
    • http://look-hotel.com/31795852126wn34q.pdfIn PDF document text
    • https://meletiwupidime.weebly.com/uploads/1/3/5/3/135313264/da584a983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420764/normal_6031c04709b62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443594/normal_5fc99891d7acd.pdfIn PDF document text
    • http://onlinetiser.website/180793333187wg79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447086/normal_5fcd093a6350c.pdfIn PDF document text
    • https://furogareb.weebly.com/uploads/1/3/1/3/131397930/1931406.pdfIn PDF document text
    • https://cdn.sqhk.co/noxawuge/ghhjYig/ceramic_artists_colorado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481161/normal_604effbf6ae5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465393/normal_604f0cced4975.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/hekjgoY/battery_operated_tea_lights_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/woberimi/ikl1jiZ/ice_cream_challenge_free_match_3_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485446/normal_5fdebd73a233b.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzezufe/TGdDvG0/music_ideas_for_kindergarten.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383928/normal_6038bbc662370.pdfIn PDF document text
    • http://koprovk.xyz/wabuntqvcw.pdfIn PDF document text
    • http://regse.website/wd_my_cloud_software_fr_mac150bg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 5316 bytes
SHA-256: 49f00dd6f5da9e2bbcd0d396db1d9d56a91b7c870a5b6f5e08e00b2a049b9083
font_01_sfnt_off0000fb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB75 11192 bytes
SHA-256: fed8bdc238bcdb5248d5179be526ab51b9f7aab07af59cf62ddf572849cc9fbd

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