Malicious PDF — malware analysis report

Static analysis result for SHA-256 b234c39a987fd664…

MALICIOUS

PDF

90.0 KB Created: 2021-03-31 11:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 850d22680b729753b5f50414195baf3e SHA-1: debbe6aaa4701685641ed26cc4c24999192b00d9 SHA-256: b234c39a987fd6647aae24787080b5b6b01a118b44bc6033cc6f62a2756a2de9
164 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 designed to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://dafemum.ru/strik?utm_term=the+lost+love+letters+of+heloise+and+abelard+pdf
    • https://rixexumig.weebly.com/uploads/1/3/2/6/132681576/wiviwagemaxu.pdf
    • https://pusurezifokuni.weebly.com/uploads/1/3/4/3/134317864/favikemeluvabe.pdf
    • http://lugodapamaj.mygamesonline.org/66623318911.pdf
    • https://wutosalix.weebly.com/uploads/1/3/4/6/134635680/tejadurawo.pdf
    • https://donigulajerilag.weebly.com/uploads/1/3/0/8/130874297/6b1d471ff6.pdf
    • http://dabopoxele.getenjoyment.net/vuxinamisolilivojasitobak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_f070897a76bc44ac804961611c542835.pdf?index=true
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_f5c4e77eddc44376b56aa463e2f64fda.pdf?index=true
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_698ec6e04f09473aba6491ace79cf54b.pdf?index=true
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_77dcf1e2947542eeabba938f4bce8be8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ba3e96b8-d022-455c-910f-7309c548b9e4/gijunojegijazifuzexisinur.pdf
    • https://uploads.strikinglycdn.com/files/9326c52b-8dbb-4e0e-9876-5e549d29073d/midimidotetu.pdf
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_b4a67921a5854283932ac52fa54725d8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8e95addb-eb76-4975-b12b-ec2eb0ad605e/woditi.pdf
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_4ae1c92dcb0745a0b4a9cb403fc4480e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/83e62d3f-b91e-4b0f-a37a-6479f2bcb3fe/the_fire_next_time_quotes_analysis.pdf
    • https://be5a03d2-cb36-429a-bb4d-4773f067dd3b.filesusr.com/ugd/b46ca8_b9955911614b4d1b840be5d6755bd634.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8b1be5bd-c023-45ba-933d-89102225b48b/cfa_exam_level_1_practice_test.pdf
    • https://uploads.strikinglycdn.com/files/734db7f3-6338-4fb4-a18a-69dc833f2206/61442497248.pdf
    • https://uploads.strikinglycdn.com/files/45de8487-6794-456c-85ad-0f6519d08a2c/68391056380.pdf
    • https://uploads.strikinglycdn.com/files/bfd5b857-4783-463d-a119-95292d688b11/67636496766.pdf
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_d6bca7f4f1074de2a37eeb452fa4bf47.pdf?index=true
    • http://sujawokasafu.onlinewebshop.net/80343055074.pdf
    • https://8b1d1a20-f0f3-43d5-aeb5-704ac988d6c7.filesusr.com/ugd/9dbc1d_c5303c77b62e419994bb5ae173480735.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dd2ac7f7-7c1a-47da-b15a-c140c2994218/linda_goodman_love_signs.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_off00010b6b.bin
eedc6a1502eb67c36352cfe37e2d2f6bab18f0c76ebdfd27d1b286f41abe4fce
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 5280 bytes
font_01_sfnt_off00011d52.bin
6b8dd68421d8f81ba4dedfd548a87fa0473e848108733d6e7bc570cf85433550
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D52 11972 bytes
font_02_sfnt_off00014506.bin
d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x14506 16060 bytes