Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc86e6d22677359…

MALICIOUS

PDF

87.2 KB Created: 2021-04-05 15:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 25cd9e77242e1cc3321a08f4bbf81d7b SHA-1: cf8d2a1ee693d9addca5886cdb56d77bfabd727d SHA-256: bfc86e6d22677359c3d353b61688adff5209089919b4c74dd85d5f6edcf263f9
186 Risk Score

Malware Insights

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

The PDF contains a link farm designed to mimic search results, directing users to a suspicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs point to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/award?keyword=ap+biology+textbook+campbell+in+focus+pdf PDF link annotation
    • https://zebonusifok.weebly.com/uploads/1/3/4/5/134509505/3638788.pdfIn PDF document text
    • https://wojosonasejedop.weebly.com/uploads/1/3/4/6/134613238/1489216.pdfIn PDF document text
    • https://jipaxebuperiw.weebly.com/uploads/1/3/4/7/134751602/sopemirupes.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/cff621f7-61c6-465f-b3e0-e828a00159eb/marvel_comics_sword_logo.pdfIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_0c2e70eb1b5a47edb69fd3a9b70e7244.pdf?index=trueIn PDF document text
    • http://mumelusaxinet.epizy.com/57922695239.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/lowest_calorie_dried_fruit.pdfIn PDF document text
    • https://f50ece36-1901-4a7b-9396-968a400df7f4.filesusr.com/ugd/3ecb95_2453db861ddc4beea731e5e2e367a140.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc18f412-7472-4f0c-bf35-23bf75f6cbcd/10758092673.pdfIn PDF document text
    • https://1f53f175-067f-4140-b001-f66bebc9855b.filesusr.com/ugd/c711d8_28326464d76b4f03b957af800dd13371.pdf?index=trueIn PDF document text
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_c9a693bfe32f4339b00d4d60f89e7e08.pdf?index=trueIn PDF document text
    • http://likumukifaxokoz.rf.gd/que_funcion_cumple_el_asesor_educativo.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/tosaxapigabafomuwibudato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27ee49e3-e850-476c-a296-445014488eac/is_the_bissell_crosswave_pet_pro_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6e5e784-fe98-4f9e-9f12-347f8ae0b5ba/68037393803.pdfIn PDF document text
    • https://65fca3b3-7ce8-4d56-9bc8-ebe46cc5223b.filesusr.com/ugd/f6ed72_15884b8d06194ecaba8ea551282af9d5.pdf?index=trueIn PDF document text
    • http://tivogowajap.epizy.com/odometer_statement_texas.pdfIn PDF document text
    • https://c5b3e1fc-3b55-407d-a8d9-2bfa6c9015c1.filesusr.com/ugd/6df244_345ce6d494bb40f28516dc9bc0630d2f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kabisebax/zewanofuduz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d402a54-bd47-4a9c-8dac-0c999b7c38a9/kigusulelonit.pdfIn PDF document text
    • http://limepupotof.epizy.com/online_voting_system_project_report_in_php.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_off000111d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D7 5740 bytes
SHA-256: 826fae3f0638e60c22df4d5bb9a7dc4cc0a9ee5da3c8cee41f5303b826af7504
font_01_sfnt_off0001256d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256D 11956 bytes
SHA-256: 2d7314b60a4dbb0a6c51852e994d7dbbba28b0c4d0724c4c34c84c1db19d4a38