Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37d26258da607d5…

MALICIOUS

PDF

86.2 KB Created: 2020-11-19 07:06:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d86db9f64392e22cdaa3aad24d673750 SHA-1: 5317e98d15ad111c1e550269d67b0ae7467ad669 SHA-256: d37d26258da607d50830d4cca1150f438eb1d144afd38c5778a451dd94d69f91
156 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 numerous external links, suggesting a link farm or phishing attempt to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to drive traffic to these external sites, likely for malicious purposes such as credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://traffnew.ru/aws?utm_term=rea%25C3%25A7%25C3%25B5es+dos+alcoois+pdf PDF link annotation
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/7e7a39.pdfIn PDF document text
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/5089380.pdfIn PDF document text
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/7955909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419193/normal_5fa154a68b416.pdfIn PDF document text
    • https://kidivine.weebly.com/uploads/1/3/4/5/134576756/6921375.pdfIn PDF document text
    • https://ratomewupevo.weebly.com/uploads/1/3/4/2/134234569/serozo-toxedubaj-nijakovukusavi-zixogose.pdfIn PDF document text
    • https://narukomoforu.weebly.com/uploads/1/3/4/3/134320250/1977030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_5fa71774a67d2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jifesu/59114148131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac0fe53e-611a-47ff-9458-57f9bca38dda/friedel_craft_alkylation_of_benzene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05d3e7fc-750e-4a13-8d07-777eed09d963/sasoz.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/hotmail_email_address_information.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/7472941363.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/79007699391.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_off00010cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDE 5460 bytes
SHA-256: 9e2c61e2cf31146f7713ff036b7709bef918b7d8db2d4cdc3330f17add2e62f0
font_01_sfnt_off00011f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F07 14616 bytes
SHA-256: b3809636afc6f977d3b061953e726418c4630fdc331a92baea1ee313dd0392ec

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