Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0296d76423bdf98…

MALICIOUS

PDF

71.4 KB Created: 2021-03-07 18:36:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d5f831860cb07cac1c08325186cbb675 SHA-1: af03d76431ae129556b96e3df6bbac0b7d914f06 SHA-256: a0296d76423bdf98950a5b646da6bff05151b38c605bc0b4a2ce7155078d4971
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm for SEO manipulation or to redirect users to malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://seumenha.ru/123?utm_term=delonghi+pac+cn120e+drain PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427498/normal_6044fa3462bb2.pdfIn PDF document text
    • https://gijagexerifaru.weebly.com/uploads/1/3/5/3/135322880/zozixuwurat-jalexel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391008/normal_5ffc9eec13f98.pdfIn PDF document text
    • https://vumusubivabup.weebly.com/uploads/1/3/4/4/134491869/637e48a043d.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/3686cc75-f168-4828-88b2-9a9f5321c22e/93270227161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/616d1fe5-cff3-4fb9-8138-2c3abf874f6e/drug_book_application_free_download.pdfIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_5f441f52757b4451a6759ba76b34b48d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/219b19af-e11c-42b0-bea6-751e29082cb1/warehouse_management_jobs_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e3e8447-609e-4bfc-9d8c-e53e9f994f61/gileseretapoduvisafolalaw.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_3267bacaad6843198bdfae3a082ffe03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/888b092a-9a1a-4dcf-b1ba-cebc34e5422b/5018545005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afa7e7d8-10f6-4996-8db8-b7b530510417/a_court_of_thorns_and_roses_book_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e9d1615-f635-4a92-be8e-794f690db00b/zuviwogotiralozazime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b343b03-ce40-455d-a06d-c98e1c4321e2/ketupolapegeka.pdfIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_e5bd62b181c74d4eb2199639fdc4149f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/addd8c23-2c6c-47f6-93a3-07559dee8174/south_indian_vegetarian_curry_recipes_for_lunch.pdfIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_a82c6e9e58614092807d475606f3c439.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/507bd89a-082b-4b83-a0dd-209f37ac0f24/snark_guitar_tuners_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d120abe-8ff9-4d4d-9f4a-9f3d8ae54f54/the_practice_of_gods_presence_by_bro_lawrence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24fec8e1-489d-4fbc-8cbe-2a4420f925cc/defunct_washington_dc_newspapers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cae0cdff-a45a-4567-b603-7390a6349820/quote_of_forgiveness_from_bible.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_off0000d967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD967 5480 bytes
SHA-256: def88bb6bd7d985ec8a4fc14e5ca8a1e85caa9f84573fef3ef53a73579cbb150
font_01_sfnt_off0000ec12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC12 10224 bytes
SHA-256: dc199522eccabee6270878bfbce2da51e37cb61fdd5340c3a5c0a98ad91a001c