Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb3509984340de6…

MALICIOUS

PDF

77.8 KB Created: 2021-03-13 19:42:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b131edc943ff632013ac68804e564940 SHA-1: baf4bac0a2d68fa392ccce7c6b4103a7f2a7b278 SHA-256: bfb3509984340de6b639fc63ef31e61be4d8e6ab3661133b84c86c0f0c21ce25
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and one primary URL that appears to be a redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links within a small PDF, suggesting a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the structure and link farm behavior are consistent with phishing or scam lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/strik?utm_term=falcon+bms+download+4.34 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474223/normal_60152cac275b5.pdfIn PDF document text
    • https://nuzozixajalupik.weebly.com/uploads/1/3/0/7/130739607/livivaxozozeme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453334/normal_603f3e49e272d.pdfIn PDF document text
    • https://jawuvufos.weebly.com/uploads/1/3/4/8/134856807/20aa1e460837465.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465259/normal_5ff7b3374f93d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384459/normal_6024c449c57b9.pdfIn PDF document text
    • https://bafuvigugasud.weebly.com/uploads/1/3/5/3/135308410/tideputonigisura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469638/normal_603822d8ad370.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/a6325c88-d69e-4a68-a706-3c2c3fa2b19c/nuresalizanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9301223f-f2c9-4244-9cf9-04841b16cf42/public_speaking_games_high_school.pdfIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_370c647815ed4d998508e1251e670fb8.pdf?index=trueIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_add64944512a44edb6e497af3203830c.pdf?index=trueIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_8d71b5e0b6a04539bec0d15e25f4d398.pdf?index=trueIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_303a353e1651442f8d725f1edb63c4dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0546d014-6230-4b67-90e4-9b873f05aaf0/39613726895.pdfIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_bbb40cbc5a074b81a9d9853823e47520.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea0443b4-e425-4300-b41c-88d6650db493/dipugilimarijasaru.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_5cde26eee4d94eca8c95caa616e02ef3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a5e9379-74ce-4903-9f61-ec7f4df71cdc/nudamasolelono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1980f3-d61a-4900-9fd7-bad1e8217eef/3103498652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18e39664-d788-439d-8bc8-5e91ef75377d/37222006066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a7711fa-60f1-41e5-873d-53d4a9dee257/blender_animation_tutorial_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef927955-eae2-48c9-b414-6a808e8bd545/juvodinejadogila.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_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 5460 bytes
SHA-256: d620cae06d31e7ce40be0355f922ad69dc32c62f681d30402aabf231d7738af0
font_01_sfnt_off00010395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10395 11152 bytes
SHA-256: c509c238236d23b4dbf64a1024d93a79588d57a250e86716483e37c3ba34322b