Malicious PDF — malware analysis report

Static analysis result for SHA-256 e819a3460b4be5c6…

MALICIOUS

PDF

78.2 KB Created: 2021-04-05 06:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 876e382d011ebebead6350d15086dd4f SHA-1: f446f8eee0145c46b2310b1ebd61756c6ef1a0b1 SHA-256: e819a3460b4be5c62ec63bd60156774a99d1585a1cc4b73fd951e94c783fbd8a
156 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 0.9996

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 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.
  • 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=escala+cromatica+de+colores+pdf PDF link annotation
    • https://guzaxogovi.weebly.com/uploads/1/3/4/6/134651677/fibugaloril-ninudoledonu-nujar.pdfIn PDF document text
    • http://xatubaxo.iblogger.org/bourdon_wiersma_test.pdfIn PDF document text
    • https://webesetumisurut.weebly.com/uploads/1/3/4/3/134318687/sofivivujar.pdfIn PDF document text
    • https://wapinabukodinu.weebly.com/uploads/1/3/6/0/136051982/2589467.pdfIn PDF document text
    • http://motirepefasake.iblogger.org/nawisos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/61096676721.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/nepal_new_constitution_nepali.pdfIn PDF document text
    • http://wudujijejek.rf.gd/37841289644.pdfIn PDF document text
    • http://fipizojuj.rf.gd/how_to_ms_project_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d37e935e-fb8f-4e6a-9411-5be43e4c5434/pezibanebutode.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/ielts_reading_passage_autumn_leaves_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/lapazitapasuwigupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fba8e4c-ec70-4529-a9da-3cea55e0223b/vortec_running_lean_no_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/how_do_you_open_a_graco_click_connect_stroller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/870443aa-6770-453e-b9a1-01873366caf8/31776110219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b45316d-831b-4c24-96ec-0f5757e9c7b8/sex_causing_bleeding_in_pregnancy.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/78757959724.pdfIn PDF document text
    • http://putedugiganipa.rf.gd/zadobirutuviwafob.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/idsa_hap_vap_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/kazafajokugetolofizufujo.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/dotore.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_off0000f0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C3 5256 bytes
SHA-256: 8a7e39941262b650bf31dba9555bf061a6e1cfe8ab614f73df22a93111e94ea5
font_01_sfnt_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 12108 bytes
SHA-256: caff8a374e3b0db85fd53a09f7b9cc172225dc025fd108e495f4897756a67562

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