Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb1d4d39516e523…

MALICIOUS

PDF

76.7 KB Created: 2021-02-24 21:47:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ad8512d0815d530568fc2ecf841a2b24 SHA-1: f4e6e18e8c5d76959dea912639450ed8495f3b91 SHA-256: 0bb1d4d39516e523dc9e7d5c94ba42a5602cfb5966ea24979738d527aa1b104c
126 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 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://bologen.ru/wix?keyword=how+to+export+4k+video+in+davinci+resolve+16 PDF link annotation
    • http://fawakosiki.22web.org/83903230529.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/94489153364.pdfIn PDF document text
    • http://sokuzise.iblogger.org/calcium_gluconate_davis_drug_guide.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/bajebatizalonebok.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/wixubabatoxijor.pdfIn PDF document text
    • http://vitofemegawe.getenjoyment.net/xerox_workcentre_7855_specs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bizozominam.epizy.com/free_backgammon_game_for_ipad.pdfIn PDF document text
    • http://rubipupajet.rf.gd/who_makes_the_best_30_gallon_air_compressor.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/how_to_do_the_google_thanos_trick.pdfIn PDF document text
    • http://zunijakokusageg.epizy.com/ronupezonunoja.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/wireless_n_repeater_wps_connect.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/algebra_2_connections_chapter_9_answers.pdfIn PDF document text
    • http://tipunogat.rf.gd/95677039845.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/compliance_code_hazardous_manual_handling.pdfIn PDF document text
    • http://jefefudutumoki.epizy.com/34414710710.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/1_milimetro_cuantos_centimetros_son.pdfIn PDF document text
    • http://tekubone.epizy.com/how_to_write_a_letter_to_my_soldier.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_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 5608 bytes
SHA-256: 8b0313e036f103fe68f57a29f52f86cb84b9d4f89c580c97d828030faf4c8a52
font_01_sfnt_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 10408 bytes
SHA-256: 75f21c8cc059147b3b3c63041c728bb66e5903e54dd5e2b5dbfa0f4e51ffddde