Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3484ad91552afe…

MALICIOUS

PDF

69.7 KB Created: 2021-02-17 12:47:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 03d9a41d913b6276807a0cec7c621f2c SHA-1: 9a4390862e6a6c5a5ad9249cccb663bfc75deabb SHA-256: 9e3484ad91552afe1b28f3760f447ff1b2f85743f0d2c52358aa7d779ebb068e
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 0.9998

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://crophysi.ru/wix?keyword=wcc+calendar+summer+2020 PDF link annotation
    • https://pojejuxafofivev.weebly.com/uploads/1/3/1/3/131398022/a07940.pdfIn PDF document text
    • https://mabosuvix.weebly.com/uploads/1/3/4/8/134851695/bajotofemopas_nodikigigar_fawobesutigeb_nijabezotade.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/RgjiiiA/fiwigosabowawixix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469631/normal_5fe051628c6e8.pdfIn PDF document text
    • https://jagalanir.weebly.com/uploads/1/3/1/0/131071056/kutonokigelewi-pukunuzadimonu-mujajupufa-kunemenewap.pdfIn PDF document text
    • http://marketop.club/wapogoxuprv05q.pdfIn PDF document text
    • https://tisemadu.weebly.com/uploads/1/3/4/3/134387657/d172b475146.pdfIn PDF document text
    • https://cdn.sqhk.co/jabakujivim/eySghNJ/depegetarowobem.pdfIn PDF document text
    • https://vifaseberafu.weebly.com/uploads/1/3/0/9/130969816/04c3e77f0de2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420903/normal_5fddbfd39b4f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422145/normal_5fcbe94dbf4d6.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/YIjigdJ/jurassic_survival_game_online.pdfIn PDF document text
    • https://wimaxexuxiwob.weebly.com/uploads/1/3/0/8/130874544/zilimibemigivulika.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/jdgjjjX/screen_lock_time_password_download.pdfIn PDF document text
    • http://goodshopsales.xyz/76492909794izj2r.pdfIn PDF document text
    • http://istlan.space/pressure_ulcers_treatment_guidelinesovjio.pdfIn PDF document text
    • https://lusezatakobav.weebly.com/uploads/1/3/4/3/134352635/ba6f7d10a085f.pdfIn PDF document text
    • http://remontnatali.ru/32882283317ujklf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FE 5372 bytes
SHA-256: 5aff3b255267032a6761017839888b8ee00746c6deb872c3e1b6ab391d73579f
font_01_sfnt_off0000e635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE635 10496 bytes
SHA-256: 13a30e7b6c495c4d3a4f1fb69c9cdb8d01e25ab53b09de79aca747a3349ee95c

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