Malicious PDF — malware analysis report

Static analysis result for SHA-256 b589a36f63d0617f…

MALICIOUS

PDF

78.6 KB Created: 2021-05-19 18:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d58ebf08d0d493bc957b7e2b3a05c133 SHA-1: 773829a0156d89da95cf27705176ead6549ead26 SHA-256: b589a36f63d0617f82adfbcc1cd96c24a13232f13d4e464fffbaff3f37aebd7c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF link farm, with one prominent link pointing to 'https://jacksth.ru/strik?utm_term=how+to+write+an+investigative+report+example'. This suggests the document's primary purpose is to direct users to malicious websites, likely for phishing or to download further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=how+to+write+an+investigative+report+example
    • https://cdn-cms.f-static.net/uploads/4468270/normal_60118dc37e7df.pdf
    • https://xerazagas.weebly.com/uploads/1/3/0/8/130813913/e9539f9f6d.pdf
    • https://saniruguroxi.weebly.com/uploads/1/3/4/5/134585545/959bfbc15d52.pdf
    • https://mirodogewe.weebly.com/uploads/1/3/4/8/134861862/9c04a3021463ed2.pdf
    • https://static.s123-cdn-static.com/uploads/4383802/normal_5ff514e7decc5.pdf
    • https://cdn-cms.f-static.net/uploads/4416125/normal_60263a4232d00.pdf
    • https://cdn-cms.f-static.net/uploads/4413719/normal_6012ab6d45475.pdf
    • https://silifasakesi.weebly.com/uploads/1/3/4/5/134510621/8733255.pdf
    • https://static.s123-cdn-static.com/uploads/4382429/normal_5feee3cf21410.pdf
    • https://sepefawepuvikex.weebly.com/uploads/1/3/5/3/135384525/6748451.pdf
    • https://lobizuwoxigamog.weebly.com/uploads/1/3/4/5/134515373/7698246.pdf
    • https://boboxike.weebly.com/uploads/1/3/2/7/132710801/4309fdb986801.pdf
    • https://rugibabolunape.weebly.com/uploads/1/3/1/4/131454120/5960217.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wiremeresegikon/mineb.pdf
    • https://uploads.strikinglycdn.com/files/4f58e127-e819-4373-a7fa-fba6fd88858a/dd_dark_sun_video_game.pdf
    • https://s3.amazonaws.com/zarusegibitumet/astrology_love_compatibility_report_free.pdf
    • https://s3.amazonaws.com/zategafozasiru/economic_effects_of_globalization.pdf
    • https://uploads.strikinglycdn.com/files/9ad41947-ab18-49a4-a5bb-5a707c6d9c8e/fevubosekaminaxi.pdf
    • https://s3.amazonaws.com/nafibanefexex/sad_couple_images_hd.pdf
    • https://s3.amazonaws.com/lekezaru/skyrim_mod_guide.pdf
    • https://s3.amazonaws.com/kozibowisenatu/bloomington_weather_report.pdf
    • https://s3.amazonaws.com/lekezaru/the_hobbit_2_movie_download_in_tamil_isaimini.pdf
    • https://s3.amazonaws.com/feliso/cosatto_zoomi_instruction_manual.pdf
    • https://s3.amazonaws.com/jusagi/can_i_renew_my_drivers_license_online_in_oklahoma.pdf
    • https://uploads.strikinglycdn.com/files/6395e35e-1001-4fa2-a1ec-e689803ad7c2/where_to_buy_waterpik_aquarius_water_flosser.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f5.bin
b8342a0e1eb38ca92c84d6d5cfde908b0525192522d2cc43d172832ac09bd6e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 5320 bytes
font_01_sfnt_off0001090c.bin
e9c355856bd941f1568d65fda2fda4b752a6bdfe58cf698b2533b8f26ace4432
pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 10452 bytes