Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2bfa78c5a072594…

MALICIOUS

PDF

80.6 KB Created: 2021-03-28 01:09:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1ded813682f3fb50fef4c01dbbb207a1 SHA-1: 586d1f40e82958c4eb4191eb9896b8d00f6f2a44 SHA-256: d2bfa78c5a0725943d352102aa70f3599f443842e956f7c170a9f27dd32332dc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://soxebez.ru/strik?utm_term=bersa+thunder+holster+iwb PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454971/normal_6049e389ccc20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465000/normal_603921492b428.pdfIn PDF document text
    • http://bebalezuve.medianewsonline.com/lelokubuzokek.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/technics_sl-1210gae_price.pdfIn PDF document text
    • http://relodifalixogo.scienceontheweb.net/suguvoburi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_5fd38db382f52.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/9873629802.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/31958962407.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/casio_gzone_boulder_charger.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/gasepuxekitupuluwazolojuf.pdfIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_3f3684a2d2fd495690277ef2c8a702f8.pdf?index=trueIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_f2363deda29040f2b357758bb8fc12cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86fd9337-eda0-4038-969f-53bdf3451e70/how_to_be_a_good_machine_learning_engineer.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/concave_convex_mirror_image_formation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1485ea6-c317-4dfb-80a7-937909da6114/john_deere_4045_engine_repair_manual.pdfIn PDF document text
    • http://tulajadulixo.myartsonline.com/tojewax.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/forivotusumizew.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 5076 bytes
SHA-256: 181fcfbe226f2180645f0452cc42fbab0a790d01e0df48c28408b5587c25d73d
font_01_sfnt_off00010302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 10620 bytes
SHA-256: e73653baa11dd0305c0f545ea40dcca57fc09571b5f6a5e205a8e96964e38796
font_02_sfnt_off00012739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12739 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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