Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9932e9d0ca5687…

MALICIOUS

PDF

70.8 KB Created: 2021-03-10 03:53:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2592cd2017d67d4e2c943e0303b56cf2 SHA-1: b8fcab0f250bd49d1a296b6eeb438dcc00ad1af0 SHA-256: cd9932e9d0ca56870a93601e1855b6dee5b1d4ac429bac1ac4f7ec3df9f4cb4e
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=6677+games+download PDF link annotation
    • https://vanevuzitikuge.weebly.com/uploads/1/3/4/5/134588875/mowexuziwov_fefizifejebu_bemogiputa.pdfIn PDF document text
    • http://antonioit.space/jasper_reports_documentationu8hrb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496148/normal_5ff78139d6858.pdfIn PDF document text
    • http://vazukororupob.22web.org/96050006931.pdfIn PDF document text
    • http://zexawil.22web.org/41384815035.pdfIn PDF document text
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/773f3c79c458.pdfIn PDF document text
    • https://gefetejumifigo.weebly.com/uploads/1/3/4/6/134688955/fevizakav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465145/normal_60084fe647fba.pdfIn PDF document text
    • http://dmgameplan.com/d_and_d_auto_salvage_clinton_oku8lqn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mejobu/westworld_main_theme_sheet_music.pdfIn PDF document text
    • http://gamutazuzores.epizy.com/timesheet_clock_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/gutiwawip.pdfIn PDF document text
    • http://zalevejuzerunir.epizy.com/jejupisikitefuzavitut.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/crib_sheet_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/fgo_little_santa_alter_event_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/95057297204.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/kotivuzanoruj.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/blue_jackets_roster_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/project_management_plan_template_excel_free.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/india_post_foreign_mail_tracking.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/counter_strike_1._6_non_steam_maps.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99C 5280 bytes
SHA-256: f87981fb9f1c04d285a8b570d9057d4cbab6294eb02ffadd210fe296d952c321
font_01_sfnt_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 10192 bytes
SHA-256: 032548c2bb83c87b6e4d558b20c8b1ad795ebce45e710ea42f3dc7d403297e2d

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