Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53889f9ea4231e7…

MALICIOUS

PDF

78.7 KB Created: 2021-03-04 14:56:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1aef56fcf2b88e2f2c1cb5943a74d9c6 SHA-1: 90bf71628454db7df5e662b09d2943aa0a8e28a0 SHA-256: c53889f9ea4231e78df50b678366725efa0eeada76c5f77842f8bd6d5d130532
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=how+to+make+vinyl+wall+decals PDF link annotation
    • https://cdn.sqhk.co/jigitovewuk/OTqwZif/allen_theaters_farmington_nm_drive_in.pdfIn PDF document text
    • https://xirejefeju.weebly.com/uploads/1/3/4/7/134723985/2386014.pdfIn PDF document text
    • http://xitodefigatefuj.medianewsonline.com/53941449902.pdfIn PDF document text
    • https://pupinalakarer.weebly.com/uploads/1/3/4/2/134234580/1290130.pdfIn PDF document text
    • https://porujeworor.weebly.com/uploads/1/3/2/8/132814718/9c6ec88a9b5c.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/what_does_the_poem_in_flanders_fields_represent.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/why_wont_my_canon_printer_turn_on.pdfIn PDF document text
    • https://cdn.sqhk.co/silakozafi/QjjREgf/toy_warrior_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/satasevubu/eG4Ljgb/horizon_credit_union_utah.pdfIn PDF document text
    • https://motanaweda.weebly.com/uploads/1/3/4/3/134316912/ff6ab8f.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/11281313220.pdfIn PDF document text
    • https://tejojixamabaje.weebly.com/uploads/1/3/2/7/132740549/8af66565a3b6.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/MJihshf/pipufudixutuxar.pdfIn PDF document text
    • https://cdn.sqhk.co/mizopopowaze/ahfgfAY/biganulotitupedazejipuwa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_019b70924f194aff9871aedf21de8483.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca66f4cf-f301-4e9d-8b23-797fa25ecb39/rimibir.pdfIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_94b6a2a55f8b4efcbab70f1c3c8ae461.pdf?index=trueIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_d73c35c0c5bb4cb59bcd41a3b4e190be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/630dd3d0-f8d7-42a4-b83f-63a4db6d5dac/how_to_scan_on_dell_e525w_printer.pdfIn PDF document text
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_abf0cf9828aa4864ab5f7250bdfbf391.pdf?index=trueIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_74a3feccd71843e2b576d628033a4f57.pdf?index=trueIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_6e40f090f2f447e895f6bf71c2c64756.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d3ba761-1856-4e03-86e9-ee6af96e80c9/principles_of_engineering_economic_analysis.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/classification_of_matter_practice_worksheet_answers.pdfIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_08ac4697dcbf48709d315ae84cd9ab1b.pdf?index=trueIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_42635c3febad450db9e0af7dadbf5fe0.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_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 5268 bytes
SHA-256: 49381dc94d785a8fe70e32752d15fd5c4cdb34e50d86471a70eab591075f0ed0
font_01_sfnt_off000108ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AE 10776 bytes
SHA-256: bca61f41e1bd4d7ea8ae4552ef8d1a0ee4b3f6d7e0cbbfff3cdc235e91354268