Malicious PDF — malware analysis report

Static analysis result for SHA-256 50cfd9a0c723bf7b…

MALICIOUS

PDF

85.6 KB Created: 2021-04-20 20:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: add9877f94154b1d2004ef3ded9f5d2d SHA-1: e1a4248171f36601a810cc474abbb12f2a2ab0f6 SHA-256: 50cfd9a0c723bf7b4c80901b8db5c245500dee8f063e95c295e246f0ff22bda1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO poisoning attack. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=fun+writing+prompts+for+high+school+students
    • https://cdn.sqhk.co/jogekiluse/eE2hjij/three_kingdoms_massive_war_tips.pdf
    • http://xolokeminapi.getenjoyment.net/four_caliphs_of_islam_in_urdu.pdf
    • https://cdn.sqhk.co/denepepunuja/iiAgcia/vex_3_dylan_s_unblocked_games.pdf
    • http://zamowafa.mywebcommunity.org/diratakobo.pdf
    • https://cdn-cms.f-static.net/uploads/4374685/normal_60145c90426fa.pdf
    • http://xogavuw.medianewsonline.com/ielts_general_speaking_vocabulary.pdf
    • http://punavuvipufov.sportsontheweb.net/synonym_words_dictionary.pdf
    • https://cdn.sqhk.co/nujoxodove/bRZ5uhl/bonavinukaduberarogozewi.pdf
    • https://cdn-cms.f-static.net/uploads/4455176/normal_606648f72c86d.pdf
    • https://cdn.sqhk.co/rasidepad/hao5Uig/form_c_guidebook_2017_malaysia.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3ced707c-20bd-49bb-93f1-edb15be4e391.filesusr.com/ugd/e90305_20c82894bdab4c749354d79467f6691c.pdf?index=true
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_683bc04798154c5bb74685d1038e69f1.pdf?index=true
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_cb2a1b6b66a84befbdf540432a35de26.pdf?index=true
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_420612710bcd4781a52aa44ffcd9d509.pdf?index=true
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_9c677e39838b44f193c774b9ec7fe4d6.pdf?index=true
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_5cd2ca36b32e4309b8b2c12195dd6e21.pdf?index=true
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_a1ef819fff694132bdaa74cbcad865b8.pdf?index=true
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_ca44f5b7534e4c36a0804c77f4bbeaed.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012ca1.bin
9cd810d4fc1effa04fe8070c8a1aa0528712844574416ebf06d2e421798f2d91		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12CA1 18124 bytes
font_00_sfnt_off0000f5f7.bin
1c6cf89097d429698992a715b9f287b58344a9f70e431d5d28b0d2457cc7d4b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 5404 bytes
font_01_sfnt_off0001084f.bin
0c6c9abb8330c6dc6cedea0d39171b91b2de3e2a2e430e38d35014572d68a54b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1084F 10544 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.