Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdab42143d5029ce…

MALICIOUS

PDF

79.1 KB Created: 2021-02-27 01:20:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 02ba2d9dc4cb21fc343ba39bfa87ff03 SHA-1: b97e7f915fcc0dac097d641f652f5f521391bcc9 SHA-256: cdab42143d5029ce84de7b2ac8c68f7f9d19662558ba54dd2a0d9808cfe5ff6b
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-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/123?utm_term=value+education+questions+and+answers+class+5 PDF link annotation
    • http://the-english-temple.com/msi_afterburner_overlay_hotkeyfjm8n.pdfIn PDF document text
    • https://jobexukutet.weebly.com/uploads/1/3/1/4/131452991/rawezefizes_paxogoto.pdfIn PDF document text
    • https://cdn.sqhk.co/gulizate/ghgiiIw/id_mobile_emergency_calls_only.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/jdgdqie/train_to_arlington_race_track_schedule.pdfIn PDF document text
    • https://gazulaloruvuv.weebly.com/uploads/1/3/4/6/134693071/9138238.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/xevelan.pdfIn PDF document text
    • https://cdn.sqhk.co/riragimi/ijKhjFN/garden_luscious_strawberry_theme_song.pdfIn PDF document text
    • http://mobile-media.moscow/free_victoria_secret_catalog_by_mailbpluu.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/to_kill_a_mockingbird_summary_chapter_1-3.pdfIn PDF document text
    • https://vidiguwases.weebly.com/uploads/1/3/4/3/134347373/fidituneximuzi.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/61552064639.pdfIn PDF document text
    • http://es50off.pro/afcat_gk_notesmcz4a.pdfIn PDF document text
    • http://foyou.store/milenyi4mt.pdfIn PDF document text
    • https://cdn.sqhk.co/perigupa/haKjeji/kerofigewanarajujab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://titugol.atwebpages.com/navy_medical_corps_incentive_pay.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC4 5124 bytes
SHA-256: cdeef5ff9a0e8e5e6e2f626cb041283c417207498d51b6409af8d42c8daedd46
font_01_sfnt_off0000fc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC48 10640 bytes
SHA-256: 46da00be1c9a248f8ec76e48f11e6aafde1188028560c89fc89a23320f5817b0
font_02_sfnt_off000120ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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