Malicious PDF — malware analysis report

Static analysis result for SHA-256 203b8cdc26f42d63…

MALICIOUS

PDF

77.1 KB Created: 2021-05-21 21:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 146a6e063f612d6e3f3f57a40d441a5b SHA-1: 2c147633080a10cddcfa175bde899d7347909c08 SHA-256: 203b8cdc26f42d635344362bbad54fec719747a1b14ccf517e4a48f516cbd37a
196 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many of which point to redirectors or SEO farms, indicating a phishing or malware distribution attempt. The primary malicious URL identified is https://botokaw.ru/strik?utm_term=nestor+the+long+eared+christmas+donkey+youtube, which is likely used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://botokaw.ru/strik?utm_term=nestor+the+long+eared+christmas+donkey+youtube PDF link annotation
    • https://fofosororu.weebly.com/uploads/1/3/4/6/134642422/a83649a5e36c510.pdfIn PDF document text
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/fajon.pdfIn PDF document text
    • https://wewofubajibopa.weebly.com/uploads/1/3/1/3/131381003/jaxupul.pdfIn PDF document text
    • https://kukavijeri.weebly.com/uploads/1/3/3/9/133997324/6519097.pdfIn PDF document text
    • https://fumozowafujazuv.weebly.com/uploads/1/3/5/3/135331302/todugufuti-dotowanatale-zakera.pdfIn PDF document text
    • https://sewiwojura.weebly.com/uploads/1/3/4/3/134371681/siserefe.pdfIn PDF document text
    • https://labopepiw.weebly.com/uploads/1/3/4/7/134747507/dafaf.pdfIn PDF document text
    • https://vefawotujetebab.weebly.com/uploads/1/3/4/6/134651081/cb129de9e.pdfIn PDF document text
    • https://xuremesedadewo.weebly.com/uploads/1/3/4/5/134500919/kuzewizagumabel.pdfIn PDF document text
    • https://virataxutepubom.weebly.com/uploads/1/3/0/8/130874282/bed053363436.pdfIn PDF document text
    • https://xoxulesajoxe.weebly.com/uploads/1/3/1/4/131438427/lasudasewav-jugajarivob-xokatubomujonu-lezanagizimod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc18b63a-1420-412e-8098-5b16d0f64ed0/little_fires_everywhere_season_1_episode_2_streaming.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/homelite_backpack_blower_carb.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/dallas_airport_departure_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2fdd96d-cce8-427f-9db5-c272ba8c7523/gidixotudo.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/platicas_pre_bautismales_en_aguascalientes.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/aambala_mp4_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/617623e2-a6c0-4266-8957-8e3650a33f93/how_many_decibels_is_a_dishwasher.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/writing_the_breakout_novel.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/how_to_download_thinkorswim_on_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bba5e88-b222-412c-b697-1c783a580f93/dirubopavix.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/kelulifunefabasusupesinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be1a5b2-631a-412c-80af-40b5b3240fdf/mopowodixu.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/how_to_reset_my_frigidaire_washer.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_off0000ed39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED39 5628 bytes
SHA-256: 6281d20ca35a318ce48f463299d121648afe49f4e0bfa2470c263b0fc63e5d39
font_01_sfnt_off0001003f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003F 11216 bytes
SHA-256: 61a9e1a6ba4ac189180a4ee01485a82c7c55a39842ca3e9c1d3d43c2d7ebcb9a