Malicious PDF — malware analysis report

Static analysis result for SHA-256 96763ebea3177fd5…

MALICIOUS

PDF

76.7 KB Created: 2021-03-06 20:42:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 91a56c872763ee3f484e9967c56adea8 SHA-1: 548a912a64a6535586fa6cfa029baa11f82acd4d SHA-256: 96763ebea3177fd5f3e4a99613aeb57e941f17b7ea54421f237ac245aa4fd3bf
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 a large number of external links, suggesting it is part of a link farm designed to drive traffic to other sites. One prominent URL, 'https://resalured.ru/strik?utm_term=how+to+train+legs+for+explosiveness', appears to be the primary lure, disguised by a seemingly innocuous topic. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links are indicative of techniques used to distribute malware or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://resalured.ru/strik?utm_term=how+to+train+legs+for+explosiveness PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/44110840-ade0-4789-b9db-36b7078aff41/wumerebogap.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/format_of_formal_letter_to_a_friend.pdfIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_535b9100cf5f4e5f84e63e9cbc9662de.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bofake/fipib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d56652e-3fee-48cd-a8fc-ecae6fca11ce/59419656496.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/penndot_rc_standards_72m.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/141281ae-bb19-467e-a4f8-e46803fca1b3/muvuxosadavuguzogugekitu.pdfIn PDF document text
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_a860d21f87374f87abc69ec0ede4a8f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/def87b1a-0bb4-4eb3-815c-e8a5f1472a26/epic_emr_system_demo.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/31540086689.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/kuxap.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/fugoginu.pdfIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_4a29f9f14e6b4a09983c6da4d5da2398.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0686299f-0ca2-475d-9a04-f361b486b4b4/79327680423.pdfIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_228e818869334cb98ab90300b8f5cb50.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ed0370-2b0c-4469-945c-8b0dcd083cf4/the_lies_of_locke_lamora_summary.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_37ce0a5b1795412b9cce052f2a93125d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dcc5af9-99d3-4d80-84d2-710cc08a4ded/10812464368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30147e6e-e361-4db9-b02b-a583e9ae0899/tijeg.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_off0000ed39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED39 5252 bytes
SHA-256: 2563f369d76d26c8af10aef96984c4cfb2edc599cbaba21043d5f7718e95bfe8
font_01_sfnt_off0000ff3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 10712 bytes
SHA-256: cb1f57e3e335335248476fa802904ea8d1f7c11fa6bf1a2409602c5719ed26e0

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