Malicious PDF — malware analysis report

Static analysis result for SHA-256 830c8096541da42e…

MALICIOUS

PDF

74.6 KB Created: 2021-06-09 01:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 902d3f9a544177f6f527d19b4443c7b7 SHA-1: ef3ff4bc0a7f865662a7ac763007edc9c22356ea SHA-256: 830c8096541da42e05bf6cfb591d6e2e5668a65d13fd067877ef13bd1a9c3aee
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains and appear to be part of a link farm designed to attract users searching for popular applications. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent. The primary URL, https://crewmak.ru/pbw?utm_term=tiktok+wall+picture+app+apk+download, suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/pbw?utm_term=tiktok+wall+picture+app+apk+download PDF link annotation
    • https://ruxuxosiforedop.weebly.com/uploads/1/3/4/4/134491380/zujawaxixawixe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455194/normal_601315606ddaa.pdfIn PDF document text
    • https://pelifofenap.weebly.com/uploads/1/3/3/9/133997555/2873169.pdfIn PDF document text
    • https://lereviripos.weebly.com/uploads/1/3/4/6/134663640/nuliwizigixunet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451930/normal_603d0c1f54d3d.pdfIn PDF document text
    • https://fuvetozexogix.weebly.com/uploads/1/3/0/8/130874326/8045640.pdfIn PDF document text
    • https://rejomopoxe.weebly.com/uploads/1/3/1/3/131383333/kupaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389576/normal_600e0f6852a4d.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/942612df-3696-4435-ad41-fd461aa75802/64624457245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c43454c7-8167-453e-8cbd-f3d5344fea8a/jotowamevikenuwizobelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5cde849-4ec2-489a-bfd0-8282219403d4/what_are_the_duties_of_a_special_needs_teacher.pdfIn PDF document text
    • http://pukagij.pbworks.com/w/file/fetch/144586281/does_fortnite_generator_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78a7a5f8-de2b-4e19-821a-2ef761a28a2d/twilight_eclipse_full_movie_watch_online_in_hindi.pdfIn PDF document text
    • http://lufokomarib.pbworks.com/w/file/fetch/144477843/makkar_ielts_writing_task_2_2021_with_answers.pdfIn PDF document text
    • http://momukaduwe.pbworks.com/w/file/fetch/144898494/anointing_of_the_holy_spirit_wigglesworth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4803e62d-7c18-4685-9135-e27c368b3b0b/70902883273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96d127a9-72aa-4472-8649-304eca09823f/is_it_ok_to_be_an_average_student.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/373694b5-3b15-44ee-a6c7-a8296697b712/kipozonedi.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_off0000e69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69E 4996 bytes
SHA-256: 00843de7bd2f811d120f7a81e1462870fbc464f3943d8fdc97265d97be1226b5
font_01_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 10868 bytes
SHA-256: 4534fd542c3f6a2fb7f8e551a6ee4bb718f7c41ac3a5a2cfa940056b9a7f7481