Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f3378b93c33390…

MALICIOUS

PDF

90.6 KB Created: 2021-05-29 18:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f56c5edbaf1d0727cbab497a06f711be SHA-1: 75eb771caadedd284536ea9a41c32682de84bc2d SHA-256: e6f3378b93c33390e13511bf94f473e92f629145216754e0c6034ba812d78dc2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The primary URL, 'https://bologen.ru/strik?utm_term=is+kaplan+good+for+sat+prep', suggests a potential phishing or scam attempt by redirecting users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/strik?utm_term=is+kaplan+good+for+sat+prep PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374359/normal_601b6e2c777cb.pdfIn PDF document text
    • https://medirabo.weebly.com/uploads/1/3/4/0/134040550/03c6132966104e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425912/normal_5fdbbef76a1cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413238/normal_604654415a57e.pdfIn PDF document text
    • https://fujareke.weebly.com/uploads/1/3/5/3/135391043/4cca1a5771b.pdfIn PDF document text
    • https://zunarorukozem.weebly.com/uploads/1/3/4/0/134016655/2558024.pdfIn PDF document text
    • https://tomudonaki.weebly.com/uploads/1/3/4/7/134715401/6781178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390074/normal_6043ecf3d6019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501054/normal_600b00d9a9760.pdfIn PDF document text
    • https://xadatazibinul.weebly.com/uploads/1/3/1/4/131483053/7543078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369782/normal_60546076e5212.pdfIn PDF document text
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/tujexovusetu.pdfIn PDF document text
    • https://bisopinulur.weebly.com/uploads/1/3/4/0/134000360/robatobawa-wureb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413239/normal_6004cd27daaa7.pdfIn PDF document text
    • https://nofokupefuw.weebly.com/uploads/1/3/4/6/134695722/sefofimolazob-vevinelumijis-mufopofunutupax-vemigazesem.pdfIn PDF document text
    • https://punerumoluzes.weebly.com/uploads/1/3/4/8/134897399/597e12.pdfIn PDF document text
    • https://pinejose.weebly.com/uploads/1/3/4/4/134467182/korerajup_rowikuk_jiwesupazof.pdfIn PDF document text
    • https://luxapojago.weebly.com/uploads/1/3/4/3/134327771/9314bcaa.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/14038786-9546-4181-9a06-7093f9694e4b/horus_heresy_book_8_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f60b8d3b-be1f-4112-abc3-d900b2ced8b7/43129741906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e41d7a2-05cd-45ec-8c73-bc2077e954ed/96501647652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/436d57cd-7ded-49ba-a245-064fc8d633d8/stochastic_calculus_books_quora.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_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 5208 bytes
SHA-256: bbe2a5358494232c54f8a63f2856548cfd2c173b1a34cc80ef54402f599882c3
font_01_sfnt_off00012068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 11012 bytes
SHA-256: 3a59881d74f10cf8a898a0731da67a88070902db15de3a2337fb84503c127042
font_02_sfnt_off00014617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14617 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073