Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a33989a0b1c37c…

MALICIOUS

PDF

80.8 KB Created: 2021-03-11 18:16:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af64b5ca2aad2283afe4c191ac7ff44f SHA-1: 7f752428c65a7e95768d92bc3a485a02a41d91f6 SHA-256: c8a33989a0b1c37c325c632408101fdeac55503dc88d8492a5d2e383938c1248
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs, such as 'https://maypoin.ru/award?keyword=cabinet+minister+of+odisha+pdf+download', are likely used to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=cabinet+minister+of+odisha+pdf+download
    • http://jepewadagamer.scienceontheweb.net/metabolismo_del_calcio.pdf
    • http://mavito.online/free_halloween_wallpaper_for_iphone_8_plusry033.pdf
    • http://afracheat7.xyz/sentences_and_fragments_worksheetsudk9y.pdf
    • http://webmastervlad.ru/witosaduzh7ylb.pdf
    • http://zitugaxusi.mygamesonline.org/91820453457.pdf
    • https://bobifadilow.weebly.com/uploads/1/3/5/2/135295989/judediri.pdf
    • http://formblckr1.xyz/zilagijobojinaditedepovxgvx.pdf
    • http://instapodarok.site/what_is_12b_dqhy7r.pdf
    • https://wotujajatedigi.weebly.com/uploads/1/3/5/2/135295120/1750993.pdf
    • https://zibinileder.weebly.com/uploads/1/3/4/7/134748255/daxalagalivepalevut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a1bc2ba6-a534-4748-9cdf-d29663276987/bizofikojigef.pdf
    • https://s3.amazonaws.com/tetofamuxulil/create_ad_hoc_report_excel.pdf
    • https://s3.amazonaws.com/megulu/sodawo.pdf
    • https://s3.amazonaws.com/sutawowirosuvuv/59343097728.pdf
    • https://s3.amazonaws.com/luworizesupox/70332996288.pdf
    • http://pupagerirawax.myartsonline.com/my_cloud_wd_backup_software.pdf
    • https://s3.amazonaws.com/fekaduvopigab/32985817087.pdf
    • https://s3.amazonaws.com/sikuva/xuniwiverejigukomogonofa.pdf
    • https://uploads.strikinglycdn.com/files/f6eeb805-51c9-44fd-9953-897d0ff4f3e5/mifanumatavama.pdf
    • http://kusababi.onlinewebshop.net/how_to_tell_if_washing_machine_drain_pump_is_bad.pdf
    • https://uploads.strikinglycdn.com/files/ef285aee-415f-44ac-bbb6-e7f2c6db184e/19806822746.pdf
    • https://s3.amazonaws.com/xowasosuf/iphone_camera_vs_android_camera.pdf
    • https://uploads.strikinglycdn.com/files/8012df7e-4244-4f5f-966b-31ea327ad23a/balupaxudelipakuxobu.pdf
    • https://s3.amazonaws.com/somamere/lysistrata_online.pdf
    • https://s3.amazonaws.com/tinezedu/bride_of_the_century_season_1.pdf
    • https://uploads.strikinglycdn.com/files/7556aa31-2f9a-4a72-aba3-4afab0dd5797/muvoj.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa2.bin
a17925881a061d5b457f39afc5f9cb1e436a33823f794f164f06193157b8d3b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA2 5420 bytes
font_01_sfnt_off0000fce9.bin
89910bbf96213031445159930bbe30308bc7978ad71ea4c533e876ef2cd86082		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 10152 bytes
font_02_sfnt_off00011fd5.bin
7f268005b80ff82e89639affb95403f55eddb42516abbde6a76e27226db124cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD5 16172 bytes

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