Malicious PDF — malware analysis report

Static analysis result for SHA-256 644e27a8f0b123f8…

MALICIOUS

PDF

78.8 KB Created: 2021-03-14 23:16:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 60cb7c6acb2c7cb5ee24f9e3ae742bff SHA-1: 5611b0c2eb156b2be71a95cb2d1aa857efd52605 SHA-256: 644e27a8f0b123f8f0ce3471952dfb67ee8652a758f2374704298a5dcfd6bebd
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=do+myers+briggs+test+online PDF link annotation
    • http://lavka-karamel.ru/sezigiwevigafimf2n0l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393506/normal_601048ee0dbd4.pdfIn PDF document text
    • http://am-sound.ru/uppababy_mesa_car_seat_travel_coverrgssv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382617/normal_60005a814e214.pdfIn PDF document text
    • http://oneitstore.info/kafimamipulixobiv1ackr.pdfIn PDF document text
    • http://profyhouse.ru/loxirirekar0i5tg.pdfIn PDF document text
    • http://giocodigital.website/zixisemilogufamavajadaw92gs6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475715/normal_6048179c3c238.pdfIn PDF document text
    • http://moresukko.ru/bon_appetit_chicken_meatballs_sheet_panrqhjd.pdfIn PDF document text
    • http://gnoogle.site/5952608290psll9.pdfIn PDF document text
    • http://antonioit.fun/31184334530c1srl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485813/normal_603489875663b.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/116043593t8aqd.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/nuruvapozixix/vajaxuvevexizarogelateri.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/femuxelixikarol.pdfIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_2be2ee82344e4b96af3418547c820ac6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12042301-a6a3-4492-bcbb-3d004bf4586a/wunotobukumirusuguduk.pdfIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_e9085b76eaf443e2a318fc0900fdbeaa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/69711351559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf45f8b3-e9f9-4029-bb2e-7d73f173592e/how_to_reset_white_rodgers_thermostat_1f79.pdfIn PDF document text
    • https://591379ed-26d0-4405-baa7-5b8dadede013.filesusr.com/ugd/866ffa_769c3025b4b640c1a3db2abaeebadd30.pdf?index=trueIn 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_off0000f868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 5036 bytes
SHA-256: 001b67eb2c0ae4f1a98fa9916713ce1f9723967e3a321142a8868f93f565e28a
font_01_sfnt_off00010984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 10772 bytes
SHA-256: edf1c1407641d4d57ab48f03eb8cbc8b68394f7c66a82a55675b9685c6807d85

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