Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb27b97c1ce445a8…

MALICIOUS

PDF

76.0 KB Created: 2021-06-07 22:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a1dcec2d2e8ff577ffe7c905336f6d97 SHA-1: ece0bbcbadb8451fa862eeb3a8415922e214e59c SHA-256: fb27b97c1ce445a8f55898b05cb8c5ecc02c3c3233e122df0918bbffb12253ce
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL, 'https://synerhu.ru/pbw?utm_term=what+does+formation+expenses+mean+in+football', indicates a lure based on a search query. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its deceptive content and link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://synerhu.ru/pbw?utm_term=what+does+formation+expenses+mean+in+football PDF link annotation
    • https://ludefojixik.weebly.com/uploads/1/3/5/3/135347049/3a31f236d368d70.pdfIn PDF document text
    • https://sesoguxanijiba.weebly.com/uploads/1/3/5/3/135309487/2f5a7c94ce979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495994/normal_600ea64da657c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484993/normal_6013e63de5453.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/pimizutuwesopobufu.pdfIn PDF document text
    • https://sazofezobixana.weebly.com/uploads/1/3/4/5/134524546/mipidogiwadazevul.pdfIn PDF document text
    • https://fegalovawi.weebly.com/uploads/1/3/4/3/134349911/zewomegapaguju_gazelifapebo_lurojosapipup_zosumi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443574/normal_5fdb1f485e3bb.pdfIn PDF document text
    • https://wagebesalumiral.weebly.com/uploads/1/3/4/8/134846814/juverewamikijivuguze.pdfIn PDF document text
    • https://nokuzase.weebly.com/uploads/1/3/4/7/134765685/damadomumuduken.pdfIn PDF document text
    • https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/nubuzuzifonu-viwela-nobipirug-bexokivufajidoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366009/normal_6003e883db1ec.pdfIn PDF document text
    • https://jojusilinu.weebly.com/uploads/1/3/4/3/134343509/sipejuzivif.pdfIn PDF document text
    • https://matamelo.weebly.com/uploads/1/3/1/3/131384575/2256978.pdfIn PDF document text
    • https://bupigesow.weebly.com/uploads/1/3/4/3/134360728/bd54fb4760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_603dbbb8c04d1.pdfIn PDF document text
    • https://mudikelupiviw.weebly.com/uploads/1/3/5/3/135300608/3677013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_60312ef6ba428.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449395/normal_5fe5ab11dff00.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/dcb1dae4-d5f4-4531-9afc-6b652d954f67/dd_3.5_wizard_items.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5beacabe-4d63-4236-bd66-fe2e9a7071a3/manualidades_con_papel_lustre_para_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6a568d8-f654-4146-98bc-d7a80145e6c3/fovej.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_off0000e9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B1 5500 bytes
SHA-256: bc5c1064e3697ba05cf66aabef9013fe9e718cedbf23c71af6470a1c514c2400
font_01_sfnt_off0000fc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 11184 bytes
SHA-256: a3a745b85fb148495b5200e0f689b8c1251ab1d45c2a3d64aac61a2de5557f73