Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede6c33b69804d51…

MALICIOUS

PDF

83.5 KB Created: 2021-03-07 21:45:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b71eac7baccaf60b2aa465eff5c2052d SHA-1: db95594f9e00f8cdce6177c88852dee518ace0ed SHA-256: ede6c33b69804d51de4a712c3b699360257fc5dc830c38b78a857cc86b48d1d8
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 SEO-optimized PDF documents, suggesting a link farm or content-scraping operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/wix?keyword=the+watsons+go+to+birmingham+study+guide+questions+and+answers
    • https://static.s123-cdn-static.com/uploads/4501654/normal_5fcecbdc39a73.pdf
    • https://cdn-cms.f-static.net/uploads/4451353/normal_60126a3a17a54.pdf
    • https://cdn-cms.f-static.net/uploads/4376086/normal_5fdb72e46d096.pdf
    • https://tesafugefiwa.weebly.com/uploads/1/3/5/3/135318727/2785046.pdf
    • https://serirufudo.weebly.com/uploads/1/3/4/7/134712976/04040ad.pdf
    • https://cdn-cms.f-static.net/uploads/4412606/normal_601245a464bb9.pdf
    • https://zuzunavodezap.weebly.com/uploads/1/3/0/7/130776081/mukezig.pdf
    • https://saripubisopa.weebly.com/uploads/1/3/5/3/135322362/febadopobufekif.pdf
    • https://cdn.sqhk.co/gotuxixovumu/qij6iep/rabbit_tunes_dash_looney_rush_2020_apk.pdf
    • http://fragcups.com/sample_project_management_closeout_reportqbmln.pdf
    • https://nopiviwefimak.weebly.com/uploads/1/3/4/7/134708781/novafoxavu.pdf
    • http://livecopyrightverification.com/1998_harley_softail_service_manualn7hxh.pdf
    • https://cdn.sqhk.co/vamunidibu/5gj3fBJ/pick_me_up_cafe_yelp.pdf
    • http://prizinsta.info/how_to_put_a_walking_foot_on_a_berninac1208.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_2832d21faf014ae69762b4e4f5040371.pdf?index=true
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_179ae3755d2e45dc9b23d17d3268dcb6.pdf?index=true
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_fd390ccbb39645f1ad98ef24b4bce0ad.pdf?index=true
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_40b1f53f83354b2d871141de60519dc5.pdf?index=true
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_7f95dbe19a3c43528ae71db64907bdfd.pdf?index=true
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_9b2871a79dcf49f38c1cc6193e1678a1.pdf?index=true
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_76a26f717c704a2d9e184eb86169bd7e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa68.bin
7336beb570a4d9aa6424c7320d7b4d4e7bc2ac6540aede2ce1c482bc8a395ac0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 3924 bytes
font_01_sfnt_off00010824.bin
e5c8e542821133558545776d517388bec7102d3a748cc8303d56d25e5ecd55f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10824 5616 bytes
font_02_sfnt_off00011b19.bin
2f54c6badee94071a264e5351dbd7d3f7a6636a2aea393afebbfcd1061d551b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B19 10664 bytes

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