Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ec5d69d4b39cd4…

MALICIOUS

PDF

77.3 KB Created: 2021-05-10 14:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 76a7bd452e1b0eb8ccbc41bbbc3945b2 SHA-1: 998c8987836788aec014b275869afcc1f938a2f0 SHA-256: a2ec5d69d4b39cd46f2dab318474caa3d497ba130996402f9264491a5df67515
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 0.9993

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://jumiwimov.ru/strik?utm_term=why+does+a+patch+of+my+skin+sting PDF link annotation
    • http://ihsteam.ru/tolokesilaludj6b69.pdfIn PDF document text
    • https://cdn.sqhk.co/texirova/diRdygj/19338346942.pdfIn PDF document text
    • http://pop-marketplace.ru/571669700793ucci.pdfIn PDF document text
    • https://cdn.sqhk.co/duxapotor/ghaANij/72570592600.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/fjfhhhH/fuganofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408584/normal_600e9beaf1905.pdfIn PDF document text
    • http://yewes.fun/libegovujebetl14e5.pdfIn PDF document text
    • http://thiswaytovogue.com/demosapaminurateg6z.pdfIn PDF document text
    • https://cdn.sqhk.co/mixubiki/jcMOggm/39744511089.pdfIn PDF document text
    • https://cdn.sqhk.co/moxelutedoje/gigAqUN/wuvufezafepenu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390680/normal_5fdeefa330bfc.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/edNU0hb/cara_membeli_voucher_game_di_shopee.pdfIn PDF document text
    • http://uuuuull.space/paper_bag_princess_plotitr5r.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Cm9jfWu/13324013923.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/TThfZij/dinosaur_battle_world_championship_season_3.pdfIn PDF document text
    • http://zesaguzijor.mypressonline.com/rangers_apprentice_movie_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/pukazibat/i0ihZhg/fodemuvego.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/danawotubew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zugepoguj.onlinewebshop.net/yajur_veda_malayalam_download.pdfIn PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_2f61338bedb24bcc900e2d7fbd225d7d.pdf?index=trueIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_7e303b81ad72453abaca5c71cd03d0f6.pdf?index=trueIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_69db10ea4a3e4674a86028eb5060e776.pdf?index=trueIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_3780df1f8b62490faf7a3fecf75a6a44.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_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 5620 bytes
SHA-256: 8472c2bad83f7ad20ff0699a808ed72e2a8157c0c14ed0944d1e00dec949b19c
font_01_sfnt_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 10772 bytes
SHA-256: 8d7b98f8d17153b37d4017855783e2d64601f6df758bed64a1835c5bac1a697a

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