Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39d8451431c3b72…

MALICIOUS

PDF

102.3 KB Created: 2021-03-18 13:09:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9d9eda9247705a7c86955a58ed3942f0 SHA-1: bdc4df97dd0fa78cacf9b0af7d054f5681fd6e85 SHA-256: e39d8451431c3b7250b57bfb2cb396e158317c7117d8c248f31727a8025fb882
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/award?keyword=le+cogito+cart%25C3%25A9sien+pdf PDF link annotation
    • https://resawipodejevi.weebly.com/uploads/1/3/0/8/130814711/da9e7e47565780.pdfIn PDF document text
    • https://pixasowurixes.weebly.com/uploads/1/3/4/9/134904492/padoposorax.pdfIn PDF document text
    • https://cdn.sqhk.co/gotoruzud/gjdDYgi/playstation_network_sign_up_us.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368768/normal_600905d4202dc.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/PgQjgy7/sasulilunel.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/uhdgfS1/forged_fantasy_heroes.pdfIn PDF document text
    • https://lejujazu.weebly.com/uploads/1/3/5/3/135337057/kolubu.pdfIn PDF document text
    • https://kuserivexujeza.weebly.com/uploads/1/3/4/3/134331384/2654188.pdfIn PDF document text
    • http://halfraire.xyz/toastmasters_table_topics_questions_christmas25in1.pdfIn PDF document text
    • https://lumozumaxovoj.weebly.com/uploads/1/3/5/3/135348549/fulukozifirapo.pdfIn PDF document text
    • https://cdn.sqhk.co/filumabit/heKFmji/the_tribez_build_a_village_hack_mod_apk.pdfIn PDF document text
    • https://wekowemawifov.weebly.com/uploads/1/3/4/2/134266616/nedux.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/iihyibb/67972392750.pdfIn PDF document text
    • http://arendagg.xyz/logical_reasoning_question_in_hindivm9wt.pdfIn PDF document text
    • https://vidafipi.weebly.com/uploads/1/3/1/6/131636743/nujasamedopiwimi.pdfIn PDF document text
    • https://revixapega.weebly.com/uploads/1/3/4/6/134619396/f6992bf65a2fba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413454/normal_6035afa520bf5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://birukuf.onlinewebshop.net/tujixivibiso.pdfIn PDF document text
    • http://pisonepegosa.myartsonline.com/97939278366.pdfIn PDF document text
    • http://lufiwivumijej.myartsonline.com/xutinija.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_off00014b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1F 5372 bytes
SHA-256: 5f4b2799155e82d1ca4ad5eab517b08f09152c2e72f2a97cf5b85e761a2757bf
font_01_sfnt_off00015d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D37 14816 bytes
SHA-256: c37dc56145cedd7d590ea99709f543080b82e9122ef9646ae23e5dcfeafd69a3

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