Malicious PDF — malware analysis report

Static analysis result for SHA-256 18932aedb8ae7071…

MALICIOUS

PDF

73.5 KB Created: 2021-06-05 17:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f98bba6a77093edc247ec62bbb2058f5 SHA-1: 749fbfe09055b052248fff43b71625348162fcb1 SHA-256: 18932aedb8ae7071755c5319d0022c8b35fe614e2916369a65eca08cfdfca32e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that point to other PDF documents, likely for SEO manipulation or to distribute further malicious content. The presence of multiple external links and the PDF_SEO_LINK_FARM heuristic strongly suggest this behavior.

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://jumiwimov.ru/wb?keyword=kohler%2018%20hp%20magnum%20engine%20spark%20plug PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464522/normal_5ff5b35f36848.pdfIn PDF document text
    • https://xumejiti.weebly.com/uploads/1/3/4/5/134529375/8456798.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410462/normal_5fec9381f233d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486201/normal_5fd2f3cd88eb0.pdfIn PDF document text
    • https://telutowi.weebly.com/uploads/1/3/4/9/134904764/zopejuforagikugikuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428062/normal_604da9e9b6060.pdfIn PDF document text
    • https://lokesikaneweb.weebly.com/uploads/1/3/1/4/131437695/3797946.pdfIn PDF document text
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/6142521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495059/normal_606b09ae3b457.pdfIn PDF document text
    • https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/nopebekugasuxit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374185/normal_5fcf9952299c2.pdfIn PDF document text
    • https://tizezesi.weebly.com/uploads/1/3/4/0/134041120/jozezolenorowo.pdfIn PDF document text
    • https://fupefodomixeja.weebly.com/uploads/1/3/4/8/134889506/zedirajumemifasoxif.pdfIn PDF document text
    • https://tusixifowidafoj.weebly.com/uploads/1/3/1/4/131437116/6804206.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/cf0a0c13-19aa-4d4c-93fd-add5c4136e73/86203056426.pdfIn PDF document text
    • http://likanegi.pbworks.com/w/file/fetch/144513858/29602774658.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/f/b1_reading_comprehension_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f714be3-9361-47b3-b4f7-af7a6ea60fd0/nitazubejasomebofaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbe58913-c593-4812-8e4d-4206fddd1e95/nursing_diagnosis_for_dehydration.pdfIn PDF document text
    • http://noxiwako.pbworks.com/w/file/fetch/144515841/what_is_the_order_of_the_wings_of_fire_book_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a98f11ff-448b-47bc-921a-913e698e0ee0/46069212680.pdfIn PDF document text
    • http://lojefizowoj.pbworks.com/w/file/fetch/144619908/unit_4_worksheet_2_physics.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_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 5512 bytes
SHA-256: a007e9f8d031525642aa0aa4edb3a4e4ce2d98a934dafe1cf44010cd62d252ee
font_01_sfnt_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 10364 bytes
SHA-256: 31761e999e154ade10cda3b7118a85fe5cb67fb824d9313dd12bb9265e2511f6