Malicious PDF — malware analysis report

Static analysis result for SHA-256 729a05ecb5fdcc36…

MALICIOUS

PDF

74.7 KB Created: 2021-03-27 10:21:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 945ad0d649ac186fb301e2778885b07a SHA-1: 786ef538b634704519d99c05dbc9ba6044d89b5b SHA-256: 729a05ecb5fdcc368a3919b2da75be4b111ffe4299d8ccddb3fa8ece0ba54035
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one to 'jumiwimov.ru', suggesting a link farm or phishing attempt disguised as IELTS study material. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/strik?utm_term=ielts+writing+task+1+general+sample+answer+band+7
    • http://koolmaxt.online/what_caused_the_first_world_war_2puxli.pdf
    • http://byt-upak.ru/wemaper1iv5.pdf
    • http://skidki-day.store/xiruzepojaiwocb.pdf
    • https://cdn.sqhk.co/wadupaxi/tYVKihe/m_c_discount_butler.pdf
    • https://cdn.sqhk.co/salavogi/ifXijgh/tasofulugoronuwanadet.pdf
    • http://mitsumoro.ru/a_little_life_books_a_millionwr4r3.pdf
    • https://cdn.sqhk.co/pobijejok/g9Vhhig/video_game_subscription_box_uk.pdf
    • http://idealica-official.website/the_iso_zone_ps2_gameskuj8s.pdf
    • http://lami-lashes.site/14029148317pj91m.pdf
    • http://pycnidwzxc.info/wa_gas_tax_increase_2021rqmjh.pdf
    • https://cdn.sqhk.co/feguzuvubut/Jji0uid/mcat_test_scores_for_medical_schools.pdf
    • http://kukushpa.fun/54558930893f3eb7.pdf
    • http://nonretloli.site/hillsborough_county_schools_calendar_2019_to_2020zqutr.pdf
    • https://cdn.sqhk.co/fabozesemi/S1ihhgR/icee_maker_game.pdf
    • http://shimano-stradic.ru/prefix_and_suffix_worksheets_for_5th_grade4vhy3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_4158d31850e8450f9157a25e8c2a3cea.pdf?index=true
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_06d70ef7fecf4b04955de877e998c1e6.pdf?index=true
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_f0fd64adc09c4142ac303d8d69bdd779.pdf?index=true
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_6097760fa3a44e599cf131d95181efc9.pdf?index=true
    • 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_off0000e26a.bin
af83365b561367ecb0369242c4ac8f59a6d28498298b1d2a8409ecde1a8018be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE26A 5644 bytes
font_01_sfnt_off0000f5a7.bin
7baf7e304ccd35c42aabc0bd963734c44adc3c0a9783155ce4b6b19141aeadbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 11724 bytes

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