Malicious PDF — malware analysis report

Static analysis result for SHA-256 274a77676ab504be…

MALICIOUS

PDF

78.6 KB Created: 2021-05-24 03:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0204833ce79beb768763ced6c4058fdc SHA-1: c74011526e1f9a84cbcee693faa16b28c4788f18 SHA-256: 274a77676ab504beca743f26470981aaecb5e68c349c0b22412a8fb48647f1de
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable platforms like Weebly, indicating a link farm for SEO manipulation or malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and the presence of numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://puxipevabama.weebly.com/uploads/1/3/4/3/134308905/batuduxus_ripolirotiban_fisovotubata_dodajonubis.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4500186/normal_601e428263880.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474450/normal_5fe62c31848b6.pdfIn PDF document text
    • https://lewanodeb.weebly.com/uploads/1/3/4/8/134885095/4c3ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407562/normal_5fd3c9805d71c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379377/normal_5feb9792573a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420775/normal_5fdc7a39196d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368949/normal_5fff02d9ea4e8.pdfIn PDF document text
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/6189259.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_600d86d923902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_601742cb5fe44.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/G1IkLG9TFNM/wb?keyword=repair%20frigidaire%20refrigerator%20not%20coolingPDF link annotation
    • https://uploads.strikinglycdn.com/files/5f067c0d-d133-4584-8a00-3d25568ffd5b/zivigujij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1654d98-d8c4-43d3-a1da-adfd9aba0e2a/mumatunivuvubedesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/087f3830-0d25-4ada-8bf1-52960d331b1b/how_to_become_a_master_diver_in_the_navy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/234d1f8f-6559-4429-ac59-051eff741e33/pentax_k-70_vs_pentax_kp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94efd527-5c2c-4e0f-8a00-a5be65eadfb7/29311894345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ed994a-fc69-4e90-86b3-cbc58a4aa44a/how_to_reset_control_panel_on_lg_refrigerator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/810a4e7c-7f4a-4e5c-ac96-5736ada82c11/james_patterson_alex_cross_series_list_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3306932c-4648-4d32-9cc8-8ad334a96f13/sujomaxadekolirorupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe6d3d8a-1865-47ca-abbf-ddc5ac6c0618/where_can_i_watch_the_spook_who_sat_by_the_door.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f38697-baa0-42e9-a15f-85d1bc0221de/52353828310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e616253-392a-4f40-be71-3615cd82f135/what_preventive_services_are_not_covered_by_medicare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f826f281-e82c-4249-b532-c7c1d95db55f/the_maze_runner_series_book_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09227199-bff3-45df-ba2f-6b481f1dd6bd/pobuxuzaxog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8868d58-509a-4327-85ff-b7eb7fe3f51f/vuwomoguvubozurinakevurad.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_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 5152 bytes
SHA-256: 3b17037b2a45aefbbe532a1089cbe29c7d181c41434e048601e300811ca7bc4e
font_01_sfnt_off000108c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 10444 bytes
SHA-256: 71f7d601c0601df13d15e09015da139efec3f5056572c67889343fc99823aaf4