Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d607f9928e28d91…

MALICIOUS

PDF

77.1 KB Created: 2021-02-23 22:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ca1be9960e86e3b5cec8b35793268733 SHA-1: b374b07ef1dee0618bee57fbd7bf991a8d94a2da SHA-256: 8d607f9928e28d917c2b78f83c70c6bd4d26096a6a53a520460bc5809fdb3ed3
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 0.9998

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://crophysi.ru/123?utm_term=best+international+law+schools+europe PDF link annotation
    • https://cdn.sqhk.co/kigimijexap/forjche/gunnersaurus_rex_toy.pdfIn PDF document text
    • http://teasmall.space/25049665233vl5tx.pdfIn PDF document text
    • http://efarbok.xyz/691543587349lmfp.pdfIn PDF document text
    • http://magazinrf.xyz/best_android_studio_projects_for_beginners7z090.pdfIn PDF document text
    • http://itdomen.fun/xefabufax824ni.pdfIn PDF document text
    • http://my-favshopg.online/11_creative_writing_exampleskpnjl.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/1taeSu0/90570686766.pdfIn PDF document text
    • https://cdn.sqhk.co/zusisoko/jTjc6gi/fotijafodutamazuvex.pdfIn PDF document text
    • http://persequen.com/marilyn_hickey_signs_in_the_heavensm3exw.pdfIn PDF document text
    • http://islemleriniz.org/xfinity_racing_standingsug0ks.pdfIn PDF document text
    • https://wazeketarawowaw.weebly.com/uploads/1/3/4/5/134587567/6978040.pdfIn PDF document text
    • https://voteweze.weebly.com/uploads/1/3/5/3/135346586/547296.pdfIn PDF document text
    • https://rilobajivevet.weebly.com/uploads/1/3/1/4/131438099/pupipenotu.pdfIn PDF document text
    • http://parrrtner.xyz/lenovo_premier_support_services8fnuo.pdfIn PDF document text
    • http://ridunculus.com/razoruxowajuwowofugufubr82r.pdfIn PDF document text
    • http://dozazexopavo.22web.org/how_to_set_honeywell_5000_thermostat.pdfIn PDF document text
    • http://lovojat.22web.org/debinasogep.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
    • http://sazizonega.rf.gd/scope_of_work_template_software_project.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/calendario_liga_mx_clausura_2020.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_off0000e41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41C 5044 bytes
SHA-256: ce022cbdae27d4edf27adc9416a759b156048568c958a6b0a041601f7dc64e5d
font_01_sfnt_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 10332 bytes
SHA-256: 95b5d4d38e312534f17826637c547e8b54721d09a383fc1e85d16a04505277b7
font_02_sfnt_off000118a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34