Malicious PDF — malware analysis report

Static analysis result for SHA-256 584d9972ee7d3d9a…

MALICIOUS

PDF

86.3 KB Created: 2021-03-24 02:34:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbf26e97c4a9352e2a191f895cab0577 SHA-1: eefadcea7e77256cb1b363c02a7d1db67e7dc286 SHA-256: 584d9972ee7d3d9a510e48d1d7846ee2ccd219faac092af1f0c8f9e00666fba8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs, such as 'https://pelibifir.ru/award?keyword=solving+compound+inequalities+worksheet+pdf', are likely used to redirect users to malicious sites. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/award?keyword=solving+compound+inequalities+worksheet+pdf
    • https://zujujogonawanuk.weebly.com/uploads/1/3/4/8/134879196/renijejedam_gabux_lolilox.pdf
    • https://cdn.sqhk.co/kigakikijebo/ZiiW1gc/43436168351.pdf
    • https://kobetuditi.weebly.com/uploads/1/3/4/4/134446504/paxiz_zagozudiza_lufap.pdf
    • https://cdn.sqhk.co/jirowolad/jahe8Ev/4814426346.pdf
    • https://namoxatiki.weebly.com/uploads/1/3/4/4/134477177/1593401.pdf
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/480500.pdf
    • https://xemelavu.weebly.com/uploads/1/3/1/4/131437726/2588339.pdf
    • https://nimafomu.weebly.com/uploads/1/3/2/7/132710507/7742096.pdf
    • https://cdn.sqhk.co/rowunozimop/CI27hca/33320746992.pdf
    • https://miletotafog.weebly.com/uploads/1/3/4/7/134758503/zekekijisow.pdf
    • https://gopiwalugase.weebly.com/uploads/1/3/0/7/130738825/kavow_kakujur_kojaw_somuto.pdf
    • https://defonufagij.weebly.com/uploads/1/3/4/3/134360363/vadozifatajug_wutiverof_fajabiguda_mogibulo.pdf
    • https://vinofuloro.weebly.com/uploads/1/3/4/8/134850824/c01d0d556c4c1c.pdf
    • https://cdn.sqhk.co/baxoladipezu/iaBjigj/48004665212.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_24b5d1f93cac40d2a8f8c2bc6f0dc8b3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ca23c934-a79c-4eb1-be0c-b72e12f8c4b8/65323368857.pdf
    • https://uploads.strikinglycdn.com/files/99b0f96e-30eb-4886-af22-21e1af1dcee2/digitech_jamman_solo_xt_looper_pedal_review.pdf
    • https://s3.amazonaws.com/suxiweke/waitrose_good_food_guide_2020_release_date.pdf
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_a492c35b312244389964d48bdfac359f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/931d6499-06f3-4b17-8b1a-fae9fab26f33/radokefebow.pdf
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_edc3df523eca49a7a59da5f5b1554523.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8682bcf8-824b-4f05-a9ac-8f9b6577b1d3/canon_powershot_elph_115_is_manual_espaol.pdf
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_6700fdb1796c475fb546d08e5968e0e0.pdf?index=true
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_9b617bc14ef948278bca5c7329c42838.pdf?index=true
    • https://s3.amazonaws.com/jevelel/blue_tick_instagram_hack_apk.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/nonoxowumagumezere.pdf
    • https://s3.amazonaws.com/ronatiduzoxij/fuxatoze.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e6d.bin
3061a31860d2675354e2a02aa30e5f8eb4ad9b99188b79f83dd3033eec0baadb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 6012 bytes
font_01_sfnt_off000122ca.bin
43c71b01754a7b0c654e08e87b2f9aa2ccd4b6fd1f70ca9f7a58e1346591d6bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122CA 11964 bytes

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