Malicious PDF — malware analysis report

Static analysis result for SHA-256 83554da658143cf8…

MALICIOUS

PDF

76.4 KB Created: 2021-03-22 13:02:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 64fa01585fa7f4a6a3fd14b1d1c7848a SHA-1: 9c54a93f5a7bc108b51f90c8a6129cffcd1e3dd0 SHA-256: 83554da658143cf808d320f51eaf6eaeb2786816581ab6b9fc29ab098d6d8291
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one specifically pointing to a suspicious domain related to commercial kitchen hood fire suppression systems, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=commercial+kitchen+hood+fire+suppression+systems+near+me PDF link annotation
    • https://cdn.sqhk.co/laxepinam/SfhdQJX/6827641694.pdfIn PDF document text
    • http://mscredit.info/85080254175lzbhu.pdfIn PDF document text
    • https://cdn.sqhk.co/milagaleja/hi5gegd/slingshot_rental_las_vegas_nevada.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/i5IAapc/rocket_launcher_toys_r_us.pdfIn PDF document text
    • http://tehnotop.site/disturbed_sleep_pattern_nursing_care_planayamg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_021cc2e95fe04d8a9984a7525c63597b.pdf?index=trueIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_48bab6bbd4bf47a48860292e5677732b.pdf?index=trueIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_aa6d01d3e5494f58a53cdf9b2e84f24b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/kenmore_dehumidifier_filter_location.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/lojosigajegesodanoperozi.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/mapa_forgotten_realms_3.5_adventures.pdfIn PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_2a01828a384b408798656060f9b8c91d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/zelulexaz.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/peguvapabubidemet.pdfIn PDF document text
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_1d2b51b064f54166b5d2409b922da842.pdf?index=trueIn PDF document text
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_910f5a04e7bf4012a8378f5ed4088166.pdf?index=trueIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_2b25acdc9416409389012693ffb1b963.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafirawit/84714787133.pdfIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_c13302dacfac4424ad8417faa118759f.pdf?index=trueIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_4444c86d480e47d9a63fb1448acfb97a.pdf?index=trueIn 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_off0000eb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB69 5464 bytes
SHA-256: 431a1e5e97ab4740fc40c0f21d53d96b0f9add61d08c938b7840187bafd5df8c
font_01_sfnt_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 11072 bytes
SHA-256: 7a9e7f69d6d3c5c96911ac5b55771a369a5111aa36b32d8273401f05ad574967

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