Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18fe447776fd330…

MALICIOUS

PDF

87.2 KB Created: 2021-06-11 07:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 06560db2821fa34ce11b3c3679a7af99 SHA-1: ee30b745ea4083a63f1c6bfceb4978875e5a192b SHA-256: f18fe447776fd330a5dcdfc4a566aef78cd7484c82e7c6f1657c5cb52d52eb71
156 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. 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 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.
  • 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://midufefew.ru/123?utm_term=java+beginners+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367940/normal_6033291d0e61e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382771/normal_5fed62a673901.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456135/normal_5fce5ff2921ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474176/normal_5ff8af10cc21c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496616/normal_6063de70d67c3.pdfIn PDF document text
    • https://seroselek.weebly.com/uploads/1/3/4/6/134636573/976255.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401538/normal_603270c1924d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482869/normal_5fca92b700e99.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4366043/normal_60b3c406f1039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485578/normal_5fe65069c8546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460058/normal_6055689564538.pdfIn PDF document text
    • https://pugewolusaw.weebly.com/uploads/1/3/1/4/131453132/rulaguruve.pdfIn PDF document text
    • http://java67.comHelloIn 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/40ae4dd0-99db-4509-a392-0355b507f113/blueprint_medicines_stock_target.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/964a6456-81ba-4c85-a9da-092ed8e830df/small_world_money_transfer_locations_in_usa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/245c6d04-93ed-4bab-8681-4115357d2417/cinmatique_et_dynamique_newtonienne_terminale_s_exercice_corrig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8645c4e4-3e15-4ff1-9432-b718f7f075f4/picsart_premium_full_unlocked_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/331511d3-7c46-4aae-a10b-30b3d12115e6/how_to_change_battery_on_barska_safe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7621c5dd-fffd-4023-bf7b-9f6c73b3353f/application_of_nursing_theories_in_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/060abd44-2877-43ec-b287-5956284902f6/sig_sauer_p320_holster_owb.pdfIn PDF document text
    • http://javarevisited.blogspot.comIn 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_off00011352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11352 5364 bytes
SHA-256: d7d6f4b10332a192dc628fa916d586b302967505a2d58df7aed154dd3282de30
font_01_sfnt_off000125a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A4 12480 bytes
SHA-256: 318f5c301a33068399e02fb98e3c3bb1d1db7b5e8151e57e31d0c1187dc721e2

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