Malicious PDF — malware analysis report

Static analysis result for SHA-256 19259a4582dfde03…

MALICIOUS

PDF

85.1 KB Created: 2021-03-01 01:57:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dcd4cd9d595f26db5b22f212166e83b7 SHA-1: 101e7906f4a05f6ee9a954eef22c0a20cd424b0e SHA-256: 19259a4582dfde03f6fe5c3baf2a2c13a380d1dc9f5ee4ba93338f175718c45f
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-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://pelibifir.ru/aws?utm_term=what+is+norse+gods PDF link annotation
    • http://winoxolupuvil.getenjoyment.net/recetas_de_cocina_para_el_ayuno_de_daniel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449397/normal_602a4fa8793db.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/viva_el_toro_book_chapter_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390660/normal_5fddbac25aa2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493589/normal_5fdef09b35e45.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/47932789780.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/zimaredisuwege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_601a9c179b5b7.pdfIn PDF document text
    • http://miromawetibikew.mywebcommunity.org/how_many_red_fives_are_there_in_a_deck_of_52_cards.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/dungeons_and_dragons_modules_for_beginners.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/61937782972.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_off00010f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F86 5068 bytes
SHA-256: d8cf89734ba3d43d82158aa19ac39ecbde803ba97e9b360360c3a9158d38a64f
font_01_sfnt_off000120c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C8 12368 bytes
SHA-256: 51806e914828edc1faca28b9fdbf43ec5380a6701c4de5800b9a96668269649e

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