Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9dd4fe2220a4512…

MALICIOUS

PDF

78.2 KB Created: 2021-03-08 08:13:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 8c036fb98c179736efc90a1d2b019c96 SHA-1: e044b4dc6f747cd23d47f8047aed5c0ae6015207 SHA-256: b9dd4fe2220a45122dd3ff01f5c7511cbad35ec06171e45ecc8081d4c339584d
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many of which are to PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=george+foreman+roaster+whole+chicken+recipes PDF link annotation
    • http://kirakexig.mypressonline.com/zitumebun.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/BxkV4gf/colornote_app_android_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/hegjihg/airport_madness_3d_free_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wolonevavaru/hhpggsg/xowabade.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwoxebu/VicjaBt/billiards_city_free_download_for_pc.pdfIn PDF document text
    • http://vegifeda.mypressonline.com/kekewonenisosobosovis.pdfIn PDF document text
    • https://cdn.sqhk.co/ramawuvade/dhcghic/11217996826.pdfIn PDF document text
    • http://wivevadevenumet.mywebcommunity.org/barurefujijixupidosa.pdfIn PDF document text
    • http://zibikudupe.mywebcommunity.org/tajefonafegiwusaxajumu.pdfIn PDF document text
    • https://cdn.sqhk.co/satukevaguka/jhO3Kzt/ares_virus_game_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_cd9da3e4d71a47eba83f5463693b5602.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/hp_4630_printer_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/semofidu.pdfIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_e1c3e3d39bee4d1f833a5cfcd52be93b.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_07a03a7f01ef42088de952bd91c8f681.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosawef/update_huawei_p10_lite_android_9.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/boise_weather_report_hourly.pdfIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_f1710577649d4d49a0e3861342a587af.pdf?index=trueIn PDF document text
    • http://vujapoguxesak.myartsonline.com/96574950266.pdfIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_17257f4370154ff4bc7dfe0b5e001e38.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadobirak/59373027871.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_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 5616 bytes
SHA-256: 218b4d4ae7aac9bfb7550f38d5b90c4ab0dd36eaa0451d6852eeecaae991d64a
font_01_sfnt_off00010473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10473 11356 bytes
SHA-256: b23d87b8a5f864f49620d4fe41bfb588381c193f026cbcd48c2afd4c452e5ec3

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