Malicious PDF — malware analysis report

Static analysis result for SHA-256 5266962917ccf058…

MALICIOUS

PDF

79.2 KB Created: 2021-03-25 16:05:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a8b3c5a38afc5b430e49ce767aed5ba2 SHA-1: 9ed02827b4c5481a7b0db836ccade7d0d26da454 SHA-256: 5266962917ccf058782ef78076c6bd58a07b9c5e723ee4194bcd7dbda7b5602a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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 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://dafemum.ru/wix?keyword=carb+backloading+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471109/normal_60493459edd65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469640/normal_5fe9d221425ac.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/carrom_rules_in_sinhala_language.pdfIn PDF document text
    • https://volifaredibeg.weebly.com/uploads/1/3/1/4/131437601/giromiwijer.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/fg1ktgN/skyblock_server_fur_minecraft_pocket_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/penomufepuk/gKgchef/jopuvijopalijasesevirudov.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/zumor.pdfIn PDF document text
    • http://ririzobe.medianewsonline.com/ptolemy_almagest_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sifomujotaxa/KCdibhb/51564640619.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462368/normal_600724d550726.pdfIn PDF document text
    • https://cdn.sqhk.co/samivegin/3iaghhj/john_cena_sound_button.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_5fda5ad6a0186.pdfIn PDF document text
    • https://sajogosekatoja.weebly.com/uploads/1/3/4/6/134682383/mijexukimaxarujulez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474999/normal_5ffd7f1af24cb.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/9ihfigd/pafowunupisufurab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f74fb65a-4d5a-4fe2-b628-598755ca30b4/easy_american_idioms.pdfIn PDF document text
    • http://vizomonuzujo.onlinewebshop.net/15802518139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95013f57-6d50-427f-b7ba-8bfd8da2bacb/dotibobepaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a4737d0-c88b-4414-bd29-b5714515dc6e/75563528014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbdbc7e5-ac4e-4318-b895-c32db870d022/65777515337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffa6093b-924b-42c1-9205-911c3ac120c3/37504401388.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_off0000f8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AE 5252 bytes
SHA-256: e040ea598518ce7dc980d405e6ca9a9db3dd58c0eca0be3ded6545aecf5a3c63
font_01_sfnt_off00010a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A99 10920 bytes
SHA-256: 79ae99d06118ddee549b9dacc8dcd9c69ff3be89929844124d1d264a7f1aea2e

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