Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d1816aa74cf920…

MALICIOUS

PDF

77.3 KB Created: 2021-04-03 12:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 99f05cdabaecd77d669fe1b56b5a633d SHA-1: 1c0ca3910e7efe63233e90ac984496be05c88ace SHA-256: 21d1816aa74cf92093e20f7a062019416416137f8a342feb4b561bd3c4928f0e
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=muscle+after+40+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414868/normal_603a5085afae9.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/84435201311zp6bq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485703/normal_5fd0741eba8fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452621/normal_6035aa1e1dc4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366959/normal_5ff7d9e3e91d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_6057a5bebe52b.pdfIn PDF document text
    • http://comp-arenda.site/94060225067e43vw.pdfIn PDF document text
    • http://o-karte-kopilka.com/hp_laserjet_p2015_series_manualzgqro.pdfIn PDF document text
    • http://fortysgjdk.fun/metric_length_conversion_worksheetwecqi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/27a5c4bf-c54d-40b5-bc08-3ebebea4bceb/song_of_myself_10_tone.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/vasulasudexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cb4cec3-47a2-4412-807c-7834cdee13dc/examples_of_seventh_grade_essays.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8f4cd2-9236-49b0-b650-f387d5f723a0/83430233408.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/textbook_of_pathophysiology_by_harsh_mohan.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/homeopatia_definicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b917d21-2e63-4ae6-b4d3-9b8a04d881c1/regiwurogof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/992fb849-8a5a-4b93-a67b-e05a4b4eb9a8/on_the_border_nutrition_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a32e7d25-dbf7-44b4-a3ed-498508c75b34/scary_stories_to_tell_in_the_dark_alvin_schwartz_chapters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dafb5a9-995e-4918-bb3e-da0d6d7214eb/19662343362.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_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 5384 bytes
SHA-256: 5b130ebd395240cc0560897c88c6f5723ebbf6bf6bd7697685255bf8e8dffdaf
font_01_sfnt_off00010464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 10372 bytes
SHA-256: 550bc8b96ff657dd414e522649508d0b1690ba4be9cb8a15a24f9cadf5b1e5c1

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