Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f6ba9e35aab1c3…

MALICIOUS

PDF

81.0 KB Created: 2021-05-29 15:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d80cd3ac3fe1a1c2e20b83001ce7d27f SHA-1: 20544ce63c98e2393b310725d5eeab1f333a7c7b SHA-256: 54f6ba9e35aab1c35800b9347955f9baae343ef161eb35fca9a288ac372911c7
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://jacksth.ru/123?utm_term=bose+revolve+plus+soundlink+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456114/normal_6066d1c2e8f1b.pdfIn PDF document text
    • https://rikulaseno.weebly.com/uploads/1/3/4/4/134471776/dadunelapilamojexe.pdfIn PDF document text
    • https://luxoxika.weebly.com/uploads/1/3/4/8/134899107/3945285.pdfIn PDF document text
    • https://fozunisomizu.weebly.com/uploads/1/3/4/6/134666093/fufolaxusudisu-pusebot-tegudulisef-pelonoxifob.pdfIn PDF document text
    • https://sisufowikukutu.weebly.com/uploads/1/3/4/3/134311685/mipuv.pdfIn PDF document text
    • https://kazenatujexisof.weebly.com/uploads/1/3/1/6/131637291/6967a2f82.pdfIn PDF document text
    • https://kipofazusaf.weebly.com/uploads/1/3/1/3/131379409/xiduwel.pdfIn PDF document text
    • https://larikizog.weebly.com/uploads/1/3/1/0/131071312/1056486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_604d0e1c5eaf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_602a2696d9079.pdfIn PDF document text
    • https://rufuwoja.weebly.com/uploads/1/3/4/7/134735928/0ad1fa.pdfIn PDF document text
    • https://sitibopifug.weebly.com/uploads/1/3/0/7/130740553/bewuwew-farepatarati-dogajo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456135/normal_5ffad28393739.pdfIn PDF document text
    • https://sowupetu.weebly.com/uploads/1/3/0/7/130739285/jegone.pdfIn PDF document text
    • https://fevowavekotaxuw.weebly.com/uploads/1/3/4/6/134635114/246094.pdfIn PDF document text
    • https://bakigimos.weebly.com/uploads/1/3/4/3/134322269/zisemimavi.pdfIn PDF document text
    • https://wepesinojaru.weebly.com/uploads/1/3/2/3/132303052/2970397.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391326/normal_5ff75986c7a0d.pdfIn PDF document text
    • https://mitexasax.weebly.com/uploads/1/3/1/8/131857270/joraliguvapo_losixipapuv.pdfIn PDF document text
    • https://zutetovidum.weebly.com/uploads/1/3/4/4/134463402/d8e4ea3d07b8.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/51cfd340-92e4-4a35-a147-5d6d7e68f1f6/48575897908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83d97341-6dde-438d-a684-5a9939df70e8/what_is_the_difference_between_loose_associations_and_flight_of_ideas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44aac552-9701-4b29-902d-dcde9b82f4c2/36867402814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b0e9af-58af-4321-a503-5ead9b109c7e/67910319600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b87834b-fcb6-4dca-b8ca-d6c0e20e86f3/75995379306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55489a5f-880f-4c24-a7c4-e93c95615fa2/56119298897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32adcf6e-3742-49ef-ab80-8594b0d64cba/67708453304.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_off0000fbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC6 5276 bytes
SHA-256: a0120a3505469e081b750aad6ecc812ed15b1fc5ce363f77fea40e91b4588e3b
font_01_sfnt_off00010da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA4 11808 bytes
SHA-256: 17ef4b91c94d55065a9334ecddd3f1893821e07465b65d205364c19b519eada9