Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d33d9d2fd6a03c4…

MALICIOUS

PDF

103.6 KB Created: 2021-04-02 05:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 975da083ac1063cb2ad6ea80fcc9b1ae SHA-1: fc81986cac03dc4940a438161001eb5048119c8e SHA-256: 2d33d9d2fd6a03c4e18c997dfba2b202f2fd4824a8daf149101f1d5ec7266ef8
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely used as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/strik?utm_term=metal+gear+2+solid+snake+big+boss PDF link annotation
    • https://fadurobudafeme.weebly.com/uploads/1/3/5/9/135959894/mapiwog_wumanisiw.pdfIn PDF document text
    • https://safamitiwifiro.weebly.com/uploads/1/3/0/7/130739579/b3e6778712.pdfIn PDF document text
    • http://kavuxolabazili.iblogger.org/nyc_comptroller_annual_report.pdfIn PDF document text
    • http://jobipibi.22web.org/dufozaxunor.pdfIn PDF document text
    • http://konobemozitu.iblogger.org/schaum_s_outline_mathematics_of_finance.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/520485cc-2458-4444-83bf-bbd5a4315dd8/79414841399.pdfIn PDF document text
    • http://faxanudof.epizy.com/pennsylvania_government_hotel_tax_exempt_form.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/kukisupifanofikoras.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/acrobat_reader_free_win_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c4930e2-db24-46f1-a5f4-c32d6843cb72/tabla_periodica_nacionalidades.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e5c5a2-d4f8-49b8-873a-3fa9a0862cee/best_novels_about_wall_street.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/37499652579.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/33811710587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b13c836-bc68-40cc-b49f-d14685d28b59/how_much_is_usps_express.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/how_long_do_you_cook_steak_on_a_george_foreman_grill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66637546-84d7-413d-94ad-53039d8e6da4/what_filter_for_5_gallon_shop_vac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/891df51e-00a6-45cb-b7e2-728013f24fcd/pofizowenibowipas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13608c94-72ce-42cd-9278-43499d04d2d3/fexut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3664f7dc-31ec-4605-af2f-93590d858afd/tulotitadepevupuzele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d29693aa-fc11-4ce6-9914-16843426b2f8/68651818218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55203926-f14c-4f42-b0c0-6de3951b28c5/words_that_end_with_z_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/184a7631-2eb1-41de-bfa9-77576c2fb3df/memukafix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a827b542-e787-400d-b84a-42253e966e98/pua_60_years_of_challenge_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11708bcc-0791-45a0-99cd-327cdf3df6b2/how_much_did_twilight_author_make.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000145cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CD 5180 bytes
SHA-256: 89f9b216a6194a1345fb33185a8cf022bf15d26bbe895a42be7b9eb656110a5b
font_01_sfnt_off00015788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15788 5332 bytes
SHA-256: 633835a7b8d8fd861e079069e96b05ddf6b7b2adf2986b6c918e10475a196a75
font_02_sfnt_off000169c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169C1 11600 bytes
SHA-256: 50c16839a86b381ee912d68808bd8d69d79b98f3aad0a4dc6c2b8b405c36e96d