Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2bb850657013ef…

MALICIOUS

PDF

77.2 KB Created: 2021-04-27 14:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 38b44f60d6c744e2c9191d44e5cb242f SHA-1: 225049f4ad04e06a0f1f883624e425dc0886580b SHA-256: bf2bb850657013ef64adad0b4e825b55610d2c85b9b5751b537b1dfa87110974
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The presence of embedded URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://pelibifir.ru/strik?utm_term=what+does+enduring+issues+mean PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4499984/normal_5ffb9f98ade7b.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/jeoyiez/51105923553.pdfIn PDF document text
    • https://cdn.sqhk.co/bexuxoxabim/xxJjaja/color_dash_addictive_switch_color_game.pdfIn PDF document text
    • https://cdn.sqhk.co/rokijatu/ASfK1ij/mix_songs_software_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450347/normal_604f26830be27.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/icdhcjb/idle_crafting_kingdom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450147/normal_5fe43a276733b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370066/normal_606d646a49f63.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/Biage5d/shark_ion_x30_cordless_vacuum_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/gcA7ogf/52704350557.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_d4109f1aa9d842f3871dae4baf13cf54.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/679cf844-e22b-4718-ad8c-d6e9031ec75f/wafunub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beaf42a7-bc39-4648-8be4-7c3f69f9074e/97881131748.pdfIn PDF document text
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_39331dffa0eb4386b055de3003ea433e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f6c6738-fc03-4f1c-831a-c77310c3c192/how_to_change_skin_in_minecraft_cracked_1.15.2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25b6392b-a7ae-4193-a9d3-28e2b7e5c6e9/xuduvagovonof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8b7e66e-23b7-4b5b-9078-eb34ba37770d/22571589065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f594d1c-0f86-448f-b6dd-7e6b2929c9c2/76077962187.pdfIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_00ab5b52f7944adaa5f46b6d32edd2da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/207d5faa-4078-484c-aa15-ab86c1983979/is_g_shock_water_resistant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b9b85a0-807e-4e61-b038-218b1d9961e8/example_of_chronological_order_text_structure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a21bfb-36e7-4a7e-a7f5-9726820b8936/getawaduwiga.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 5220 bytes
SHA-256: b9d973cd2cb662639fbf74645749563e1fcb7a903cafb0fe3169fbd3223080db
font_01_sfnt_off000102da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 10672 bytes
SHA-256: 914fe1e5e065e3c6360e5d828cdffcaee20d2ac8872c3fc3fce92f842d94b2a6

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