Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba38135afeeffb9f…

MALICIOUS

PDF

76.5 KB Created: 2021-04-07 18:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5a3dbf16d88e174d1105b7faa589058c SHA-1: 5199783c5dfae171080ba5907c2a309c6826c3cc SHA-256: ba38135afeeffb9f43cdfe47b17238339cf0edca03affd8c689e83094066ae87
126 Risk Score

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://maypoin.ru/123?utm_term=instrumental+background+music+for+presentation+free PDF link annotation
    • http://vagivosifogezer.22web.org/mcq_answer_sheet_cie.pdfIn PDF document text
    • http://energierecrute-emplois.com/94450190384et8rv.pdfIn PDF document text
    • http://lunowizu.iblogger.org/5630356702.pdfIn PDF document text
    • https://roxobirunuj.weebly.com/uploads/1/3/4/0/134096027/4489854.pdfIn PDF document text
    • https://nogiwesetegi.weebly.com/uploads/1/3/1/6/131637024/e197d.pdfIn PDF document text
    • https://powufekati.weebly.com/uploads/1/3/4/0/134012492/992332.pdfIn PDF document text
    • https://zuwisikap.weebly.com/uploads/1/3/4/4/134441997/jewejiboki.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/XgdiaW3/caption_for_photoshoot.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/fhd6GAo/pujijop.pdfIn PDF document text
    • http://duxewazovak.22web.org/95850800135.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382614/normal_5fcd3d87d2299.pdfIn PDF document text
    • http://rakuropa.iblogger.org/zeripij.pdfIn PDF document text
    • https://viwezoluzuwa.weebly.com/uploads/1/3/4/4/134401695/9315609.pdfIn PDF document text
    • https://pitazifuriza.weebly.com/uploads/1/3/0/9/130969431/2158735.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/5810469.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/ieF7igT/nawosoze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412757/normal_600a0851cb9b2.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuxuvop/JWvidQ8/dovomide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xenikezoteboze.rf.gd/blazing_sniper_mod_apk_rexdl.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_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 5616 bytes
SHA-256: e19cbb288ea1ce3149599225703270fd71a1d5e890643af8fa571b7bb3d47f65
font_01_sfnt_off0000ff7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7F 10336 bytes
SHA-256: 096d1271735cdda816fba0830be998ab88885901b59c61963da453d0fab9eaf0