Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffda09d053540fe1…

MALICIOUS

PDF

81.2 KB Created: 2021-03-02 10:44:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 83cede45a1ebc8ee5db9d1bfcbd3cc65 SHA-1: 67f93f612e08e13a67e4e18a9ad2e003549c8e31 SHA-256: ffda09d053540fe1d3a4d60c1989c61b876f12016f3a8f310fe399acdfbb757c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://baarspo.ru/strik?utm_term=georgia+driving+test+answers PDF link annotation
    • http://bifovasux.22web.org/derecho_romano_vulgar_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/jgjbgf7/voxiturenutegezog.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxunoromi/hhIiao1/best_world_war_1_history_books.pdfIn PDF document text
    • https://cdn.sqhk.co/karapenakozi/jibUIhe/the_maze_runner_movies_explained.pdfIn PDF document text
    • http://optarfes.com/gateway_ne56r41u_biosebohz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505358/normal_5ff2043c3b541.pdfIn PDF document text
    • http://euroshopmn.space/zagezavutikiligbg4vw.pdfIn PDF document text
    • http://naykaryadom.fun/595598380693m70c.pdfIn PDF document text
    • http://bbflowers.net/business_english_course_syllabusxnwmf.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/7ghjfz5/high_volume_ringtones_download_for_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460963/normal_60100ec8aac64.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/hjHgeSF/ice_hockey_shooting_tricks.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
    • https://s3.amazonaws.com/jutenojamega/hearthstone_first_deck_guide.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_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 4932 bytes
SHA-256: bd1c3ad73a226464b4ac903ba06c2440cedf4f55228c4bd8383cf497d58ffa8b
font_01_sfnt_off00010667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10667 10508 bytes
SHA-256: 9a59e04b6ac54a4defb00959407ebedbbcf7ea8999575ecca02082041dae4b83
font_02_sfnt_off00012a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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