Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdaf0408cca342d3…

MALICIOUS

PDF

76.5 KB Created: 2021-03-14 08:48:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 59986d7dd62fe06cfb9b8086ca1bf34c SHA-1: 588613fb5ff0335ff9cbdf16773785d10ece4a49 SHA-256: bdaf0408cca342d37e545ca7b142fbb0598ccd07cc89cc513f4bf187e68f33fa
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://pelibifir.ru/123?utm_term=collateral+beauty+parents+guide PDF link annotation
    • https://bivedaniliged.weebly.com/uploads/1/3/4/7/134732971/7683228.pdfIn PDF document text
    • https://buresususotolo.weebly.com/uploads/1/3/2/7/132710635/basil-livovakeje.pdfIn PDF document text
    • https://mibugekokedepi.weebly.com/uploads/1/3/2/6/132682655/tikebabaxode.pdfIn PDF document text
    • https://cdn.sqhk.co/fepefudasor/iaXX2ge/ncert_class_9_chemistry_book.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/PE0hath/14200543221.pdfIn PDF document text
    • https://buzoxebujodi.weebly.com/uploads/1/3/5/9/135971705/1502676.pdfIn PDF document text
    • https://cdn.sqhk.co/bimonabozo/gcphixp/fimegiwowi.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/ihRurha/buxegutonokokuf.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/megujobemegor/what_if_movie_kevin_sorbo_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/kusosig.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/rules_for_writers_diana_hacker_9th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/lite_android_emulator_for_windows_xp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df4a3b14-fb59-4a77-9afe-f0c5210b6b53/barrons_ap_english_language_and_composition_9th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9cc5c21-3bf2-4b7e-a2f3-ddbdadf9cd6d/42655189924.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/63123612443.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/buguxogoteladuxevupufudov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb1ed1f7-d584-4ce0-bf08-404765371948/stock_market_investment_strategies.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/metformin_maximum_dosage_medscape.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_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 5276 bytes
SHA-256: 1b729c117251781616a39b72dae13b81fea5c62891a8080fb6dac7fcb25dbe8c
font_01_sfnt_off0000fff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 11172 bytes
SHA-256: 04001d32a0807b2ffba55c2cf0d248f15bfc75be658f12b2140ecb987ebdfc86

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