Malicious PDF — malware analysis report

Static analysis result for SHA-256 567d0e92c1472cf4…

MALICIOUS

PDF

99.6 KB Created: 2021-04-26 18:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1a1c07dbe09df4420ebb67cdbc5a36da SHA-1: d6e098477a3bdad4c2e638034346d051edf41c6c SHA-256: 567d0e92c1472cf4d64710b66e332721352d06ad8bb1a749574ee961edcc1541
194 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to known malicious infrastructure, specifically advertising a free download for network equipment firmware. This is a common phishing lure to trick users into visiting malicious sites or downloading malware. The ML classifier and ClamAV detection strongly indicate malicious intent, and the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dafemum.ru/strik?utm_term=tl-wr841n+openwrt+download In PDF document text
    • http://eyebrowthreadingdallastx.com/behavioral_approach_to_information_retrieval_system_designrwlvo.pdfIn PDF document text
    • http://blancop.xyz/sony_xplod_1200_watt_2_channel_ampl61ja.pdfIn PDF document text
    • http://graatorama.space/68180671552733z8.pdfIn PDF document text
    • http://digitaloffice24.ru/yellow_triangle_when_charging_phoneuqf98.pdfIn PDF document text
    • http://mihetos.xyz/sql_server_dba_interview_questionsyzt3z.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/26249084-1f52-47b4-8ad0-53717126e9e6/kivojiperamamexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98250d31-ce87-4ece-b60f-b5f0f880b7c4/kupukibupudusiwezazif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7ac0af7-c771-4425-b9cf-3d5e496a9742/95208471284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/520ce09c-e8be-4313-bb06-60dd0b3e7655/rofetukosekubetor.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/playstation_4_gta_5_cheats_ps4_unlimited_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7204a09-a3b5-4a0c-92ae-f8ff7981412f/98320061773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaf7b1e0-9043-4bec-afee-85b01448025a/what_jobs_are_available_for_art_history_majors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9226903-0fd0-409f-9c7d-9ac908d0b36d/jisegevowamoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8fa88a0-0098-483d-85e5-42aba6f54f83/what_charger_does_a_samsung_s9_use.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/61410601316.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/oxford_dictionary_app_english_to_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/vis_sheets_in_spanish.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D87 5184 bytes
SHA-256: f55ebb8d1001da20996cf49449fce70839ecc7fb4b3d18c7e9ec30ae2139b8dd
font_01_sfnt_off00013f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F56 12684 bytes
SHA-256: deb263d3c349382440505f853a29f6a9382f77f6e470a75c2fa7af8206d4fa48
font_02_sfnt_off00016a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A42 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e