Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fcca96a179f2ac…

MALICIOUS

PDF

86.1 KB Created: 2021-05-29 18:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 316503fdf903a3d21489e37d35e31f3a SHA-1: 5f84458606d0073678a7bd59fe4653b2755478f3 SHA-256: b8fcca96a179f2ac3caa60fbb4bb119cb0bf82763e5a7c0a8744da7e1fb73cb1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various websites. One prominent URL, 'https://mezovuduw.ru/strik?utm_term=plantillas+gratis+para+hacer+cuadros+sin%25C3%25B3pticos+en+word', suggests a lure related to document templates. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://mezovuduw.ru/strik?utm_term=plantillas+gratis+para+hacer+cuadros+sin%25C3%25B3pticos+en+word PDF link annotation
    • https://xigobelez.weebly.com/uploads/1/3/1/6/131606473/7998093.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455183/normal_5fff14f439ed1.pdfIn PDF document text
    • https://girusetobar.weebly.com/uploads/1/3/1/0/131071114/kijenigodada-sopakeloluko.pdfIn PDF document text
    • https://towodoruzaxigol.weebly.com/uploads/1/3/6/0/136050186/bajozevafoder.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416144/normal_5fe3f2ff92760.pdfIn PDF document text
    • https://kanapefa.weebly.com/uploads/1/3/2/7/132740413/19e820b91454a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413590/normal_6012093410684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388283/normal_605d7e86ccc56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485152/normal_6050e36819566.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/747aab6d-c5db-4242-be71-d3a34dd78721/casio_f91w_led_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4e1ef4-360c-481b-98f6-09ebac28d0e8/define_opponent_process_theory_in_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d91fe2-4996-4483-90f5-cd6becd61be6/pugarafuwumesebopoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b2ef99-bd5f-4810-aeb3-6d941ba16df1/ditixanadetozepukujeneb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd50b84-5b8e-4ebb-bc79-9230a0d2e4dd/payment_received_letter_format_in_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28202894-9e1d-4dab-aa69-429a3d8d2d80/66722590637.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f44890f-384d-4a53-a507-e792be87d348/advantages_of_bride_price_in_png.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30276d99-0c2d-4984-addb-ce6129d9e37f/adaptation_of_dialectical_behavior_therapy_skills_training_group_for_treatment-resistant_depression.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b23f0345-db41-4d9b-b0be-7d1eb6028d5e/56287544104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe5aac8d-4eb2-4dab-ba39-c0ce1c4540c1/nolupegawolirewofubiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/240af5c9-790b-4bbf-8aa2-d1061ca42c9c/what_do_you_do_if_your_kindle_paperwhite_wont_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04be2f31-2213-48f4-9b9d-2c54f8e0df2b/how_to_do_woodworking_at_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5900a44-327e-4029-89c5-ebf7711d86d8/poker_218w_mod_teslacigs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b80d8ae-05fe-478d-a98c-7dae6d21668f/76004924459.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 5564 bytes
SHA-256: dd34f485d4be32a2744932be147784e913fc34576c8fbaed435d4b0978ded4ce
font_01_sfnt_off00010c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C22 11824 bytes
SHA-256: 962286f1cc1ce034ef9594fc5fc84f01a9f06836af38c37e347471644e5133fc
font_02_sfnt_off000132a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A0 16076 bytes
SHA-256: 980605bab78f247f088a71bdd4892ae66c44e1d79ae58e8941aae93b21ee85b4