Malicious PDF — malware analysis report

Static analysis result for SHA-256 f677a6623e5dc680…

MALICIOUS

PDF

77.7 KB Created: 2021-04-01 00:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 49d1b8c13b9b65805e718262e1c55958 SHA-1: 16bb675fbd5a0d2c515c1d609b829a4585f73b27 SHA-256: f677a6623e5dc680c29fe4cf46baedec8d772e22c66ba71b8544f68260d6b7b8
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 0.9996

Heuristics 6

  • 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 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/award?keyword=currency+trading+for+dummies+by+kathleen+brooks+pdf PDF link annotation
    • https://kosukanawator.weebly.com/uploads/1/3/5/3/135304621/9687460.pdfIn PDF document text
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/4453394.pdfIn PDF document text
    • http://francobusiness.com/16690604174wjgpd.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/hhheXrZ/fejaneregajufikezanip.pdfIn PDF document text
    • http://busivel.xyz/86240804956ev7p.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/Qfzhjjj/easy_wallet_app_ios_12.pdfIn PDF document text
    • https://botapafejerevim.weebly.com/uploads/1/3/5/3/135317081/vapubelomumubuj.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/fv0iu2n/86689487570.pdfIn PDF document text
    • http://sokfresh.fun/fepakopelexidipukitesnn2v1.pdfIn PDF document text
    • https://cdn.sqhk.co/buwaxaxodi/vhahdmp/bc_hockey_u16_roster_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/pfNgjeP/how_many_lightsaber_colors_in_jedi_fallen_order.pdfIn PDF document text
    • https://zexakadobad.weebly.com/uploads/1/3/2/6/132682290/9688464.pdfIn PDF document text
    • http://arenda-comp.space/liverpool_transfer_news_latest_today_youtubei0osi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_6913cb7c15484bf5b24a1c03fd640a5b.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_c8fddf98df704e34b0c6a2b13b53ac4c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbb01ce5-55e5-4f33-8f0e-ddcad46356be/how_to_record_your_own_music_on_tiktok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/508e1d00-7052-434f-851e-c8d662de9b63/fixovawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9d97fc1-1494-43b2-b950-f337149867b7/rivabifape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f0a0ec3-29f1-4972-9584-0dc31badcdab/where_can_i_buy_a_mous_iphone_case.pdfIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_7d37f52cec784b8ea7b0448e9077a230.pdf?index=trueIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_9f761469c530400eb010820ba3b751f5.pdf?index=trueIn 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_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 5780 bytes
SHA-256: f991dfd902a25dc211f8727c5ee72abb277bada034cc2e6768d4c04cfd20449c
font_01_sfnt_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 11096 bytes
SHA-256: ba57d4ac6bebd2b70efbf46f403ab19accb9f26048583dfe7e9e87a855792888

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