Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e57320097b3256…

MALICIOUS

PDF

76.1 KB Created: 2021-03-29 01:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e262a7efcc87b2d142f3c74f3fe2f388 SHA-1: bddcd033585307a0a1468d3b94efa3e2006f1b4f SHA-256: 28e57320097b325620f5416f32a8a9db820c2a9e7113f3c6656356887652aeb2
186 Risk Score

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 0.9998

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://xezojetit.ru/strik?utm_term=autocad+electrical+2018+tutorial+for+beginners PDF link annotation
    • https://cdn.sqhk.co/busoleva/ji3hijh/tiktok_foryou_trick.pdfIn PDF document text
    • http://tryporte.xyz/61619969344x23ry.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/tgdBYt6/vertigo_epley_maneuver_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/gatidixon/4Fsiggd/textsticker_sticker_for_whatsapp_wastickerapps._com.pdfIn PDF document text
    • https://cdn.sqhk.co/xalesikozip/TFD1Ngd/snes_switch_games_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/fdibjhP/download_hide_n_seek_mini_game_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kenujowemi/gf5hIqI/xefezomixufurototapopipop.pdfIn PDF document text
    • http://8bitbeardsco.com/97547538296sq7h0.pdfIn PDF document text
    • https://cdn.sqhk.co/dasadogiso/mGnsdCm/avast_antivirus_update_for_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/rubovadu/l0B54Hk/cadbury_silk_bubbly_ringtone.pdfIn PDF document text
    • https://cdn.sqhk.co/dojidavos/hehhkEn/neo_geo_x_gold_not_charging.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_a9aff202d9754a92976efced8d5b297f.pdf?index=trueIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_eaa08e4c97314eb6a36e0aa502d6e1c1.pdf?index=trueIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_e00d4376892944118028fd4ef938b6ad.pdf?index=trueIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_30669a87131848c2aa4457449776d306.pdf?index=trueIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_c754f3e145fd4b54a8f9f848cf7efca1.pdf?index=trueIn PDF document text
    • https://7382f664-3a3a-4b84-9c04-90301528964b.filesusr.com/ugd/4b68be_f32e3d128fff4478bfef033f514abaca.pdf?index=trueIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_4ca0bf880bad4188bf91e99a2d67a711.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_off0000e88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 5836 bytes
SHA-256: 23cce23ca8bdc10850aa130d09dc81ed93a21e513ff86aa43246f453a39e888d
font_01_sfnt_off0000fc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7A 11372 bytes
SHA-256: 272b62b632957cece5253df557c9e6836b0a3e844cf9e0a48713cd0b360bd561

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