Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ed00eaa688d4b2…

MALICIOUS

PDF

83.1 KB Created: 2021-04-05 21:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 39f6970db0c95965c7fc6b8eddbb1520 SHA-1: 70b2967331b5357c845e13c6e3f84adf71129a0d SHA-256: b5ed00eaa688d4b206b0b1c62dac192dc131f0b8ca4617712a9d0302d2fd6b56
186 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 0.9992

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://pelibifir.ru/123?utm_term=game+burnout+3+takedown+pc+free PDF link annotation
    • https://fadatofi.weebly.com/uploads/1/3/1/3/131381363/b1600ec8b51c6.pdfIn PDF document text
    • http://nonly.xyz/how_to_find_calories_on_food_labelscsfe8.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/2681362.pdfIn PDF document text
    • https://pamuguvijokogag.weebly.com/uploads/1/3/4/8/134883264/ruwijoropusolo.pdfIn PDF document text
    • https://subusigigug.weebly.com/uploads/1/3/5/3/135316146/bf7784.pdfIn PDF document text
    • https://rugalasaludazi.weebly.com/uploads/1/3/4/6/134683923/moxuxovik.pdfIn PDF document text
    • http://demetoga.iblogger.org/odyssey_robert_fagles_isbn.pdfIn PDF document text
    • http://disconto50.info/25446960028pihvb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_30c28bc88d8b4826a048db704a58fec4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31849f6f-d524-4445-bbae-9a9fc6b63d8c/wahl_elite_pro_clippers_complete_haircutting_kit_79602.pdfIn PDF document text
    • http://lojofoverom.epizy.com/agregado_fino_definicion.pdfIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_d13c431320fd4b5683e6cc8d0b565055.pdf?index=trueIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_c332391d965a4152bb18502c8547aeb6.pdf?index=trueIn PDF document text
    • https://03a45e23-20c9-4b13-8d21-50c2609e56df.filesusr.com/ugd/502f3d_329515d9331e44318d859f8c065f315c.pdf?index=trueIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_7076be74a88a4595851f7fe26c7e9e80.pdf?index=trueIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_0bb08bd48e624804b18e3f26e8dbf774.pdf?index=trueIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_1df5aa5fc88143f0812b1e6c3cdf3bfe.pdf?index=trueIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_cd700148b09541a5b0cb5810aee20c11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e93ec8d-6b12-4094-8115-02a818dee354/68430276271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e06ea87f-dd17-4c5d-bab3-1593617b5460/lenovo_thinkpad_t430_ram_replacement.pdfIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_c431cfb0d2a34218956de8190ccdd8ae.pdf?index=trueIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_c96bca586f084d529a1c14273b302350.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca01242-eea6-4ea7-80b2-20cd2e778b06/48285031004.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_off0001052f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 5580 bytes
SHA-256: 99fa4dbde762a6ad079198ee420bc6e79fdbb11070dc8d95fa11e494f6b1bcec
font_01_sfnt_off0001182a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182A 11316 bytes
SHA-256: abd514a3fe20e67d37a1c9f976e38fac4f13333479b23a57874d7c4d42bde9be

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