Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d80274c0fdf1f7…

MALICIOUS

PDF

83.5 KB Created: 2021-03-09 16:44:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f12bfeec86519a342c0c690be423e2b6 SHA-1: 71dd66ac114f2120cc4778206596861c00d12ac0 SHA-256: 22d80274c0fdf1f75dd307b558f583606f65921d3c65a6838eaad0cb4f89a395
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File Execution: User Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. 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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://dugedepap.ru/123?utm_term=acrobat+pro+dc++stuck PDF link annotation
    • https://cdn.sqhk.co/zakolemafemo/shdibqY/space_arcade_games_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412583/normal_601d3a28bd023.pdfIn PDF document text
    • https://cdn.sqhk.co/madobeborozu/jgfij8M/guide_to_among_us_tasks.pdfIn PDF document text
    • http://kunepuvobimamin.medianewsonline.com/bevozipudumewiduwamovino.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/ihcPH1d/27784993290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375504/normal_6043134dbe947.pdfIn PDF document text
    • http://afterdealer.pro/19508526247otf3c.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/djhgfxa/ruwefagavoxiko.pdfIn PDF document text
    • http://natbeach.space/47058404474fynmj.pdfIn PDF document text
    • https://cdn.sqhk.co/rarinuva/ggjdheZ/sites_in_vr_app_download_for_android.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/twilight_saga_breaking_dawn_part_2_soundtrack_download_for_mobile.pdfIn PDF document text
    • http://podarokinsta.online/long_hair_beauty_princess_makeup_party_gamekveqb.pdfIn PDF document text
    • https://cdn.sqhk.co/ponajadu/lnibxvE/cash_app_bank_for_direct_deposit.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/hcjjdFG/getakubepiluvivumefiwo.pdfIn PDF document text
    • http://hs-life.ru/stealth_cam_trail_camera_sd_card_formatiyzy1.pdfIn PDF document text
    • https://cdn.sqhk.co/lulamekajasu/jiicHuW/free_business_buyout_agreement_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tujulerika.epizy.com/cara_membuat_cv_dengan.pdfIn PDF document text
    • http://xigofopaxedu.rf.gd/44432555310.pdfIn PDF document text
    • http://lavodusepigixu.rf.gd/kips_english_vocabulary_book_2020.pdfIn PDF document text
    • http://momesesewoja.rf.gd/spinal_cord_injury_file.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 5228 bytes
SHA-256: e4c256ed64dc53ef02dadc7c11968c6e59374d15df93610a386f925bc707b5b1
font_01_sfnt_off000105f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 10916 bytes
SHA-256: fafe48c65e431fe73e7d706a6908e2d131048f00368dd95e93a2438583d8c0c1
font_02_sfnt_off00012b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B82 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2

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