Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f399ac678690ce…

MALICIOUS

PDF

80.4 KB Created: 2021-03-11 14:45:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 16c5bde6e15a9a5ec97f0d97b73bdcaa SHA-1: 53342499b0b239f329a3561908c7eb8e9ae58ca7 SHA-256: 40f399ac678690ce904722022cc8b10713f49a171a26c5a43b48a0fd59d0de52
156 Risk Score

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 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 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://zajinet.ru/award?keyword=malondialdehyde+oxidative+stress+pdf PDF link annotation
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/kobabako.pdfIn PDF document text
    • http://gexedufez.22web.org/41008736670.pdfIn PDF document text
    • https://sefokasezasun.weebly.com/uploads/1/3/4/6/134690402/suluxokudu.pdfIn PDF document text
    • http://jatuligirez.22web.org/consumer_reports_best_rated_infant_car_seats.pdfIn PDF document text
    • https://mufanujirube.weebly.com/uploads/1/3/5/3/135348440/9852217.pdfIn PDF document text
    • https://dukuvewag.weebly.com/uploads/1/3/4/0/134041028/aa1e04f05266a4.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/zatazewoz/73584901242.pdfIn PDF document text
    • http://remoloki.epizy.com/how_to_draw_a_beautiful_rose_flower_easy.pdfIn PDF document text
    • http://dirunexodov.rf.gd/rojinuzupizojefur.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/who_viewed_my_profile_whatsapp_app.pdfIn PDF document text
    • http://bopunuzas.rf.gd/9707926883.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/chinese_chess_software_free.pdfIn PDF document text
    • http://vimitafukufes.rf.gd/84126628165.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/android_adb_backup_system._img.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/29586916296.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/performance_appraisal_problems_and_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/kepobuxawatamuk.pdfIn PDF document text
    • http://soriwolawiri.epizy.com/74670428158.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/32737354540.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/asus_max_pro_m1_android_10.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 5364 bytes
SHA-256: 187400443502038b839a88f2346d12568e79c306928084b9e36165fbaa553f11
font_01_sfnt_off000106af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 14884 bytes
SHA-256: 73698de16b89939164b626685920af299f6300f1e7f46a4c339e74a7643d3847

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