Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f494e47a59e53d…

MALICIOUS

PDF

77.1 KB Created: 2021-05-02 03:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c08a248a33c8c4fae3bf12535468f583 SHA-1: 998b24d4da9c0fb79cdcd2667a7e41170dcc441f SHA-256: 50f494e47a59e53d16313685e97b8f229d4836986e9407b873e104ff6b44912d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content. The embedded URLs and the structure of the PDF point towards an attempt to exploit user trust or search engine algorithms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://resalured.ru/strik?utm_term=mass+effect+3+art+book PDF link annotation
    • https://lipopujowojirew.weebly.com/uploads/1/3/1/4/131408954/8784128.pdfIn PDF document text
    • https://serirufudo.weebly.com/uploads/1/3/4/7/134712976/6db04c13c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371010/normal_60076f53e1efe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452173/normal_60396709ce831.pdfIn PDF document text
    • https://visimekariluvog.weebly.com/uploads/1/3/1/4/131483525/9956108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478125/normal_60368b44b70a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469349/normal_60032ee02f282.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_603234c0c2718.pdfIn PDF document text
    • https://zabokibijeg.weebly.com/uploads/1/3/5/3/135350751/6923202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417536/normal_5fd899ca4ea68.pdfIn PDF document text
    • https://muzuxagofonokow.weebly.com/uploads/1/3/1/4/131406885/gokifazog.pdfIn PDF document text
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/vewegibowoxel_senekiresaxebev_vibiku.pdfIn PDF document text
    • https://xesofizagib.weebly.com/uploads/1/3/4/4/134491847/jufab_nusanunijebala_vajomoz.pdfIn PDF document text
    • https://fuvuliles.weebly.com/uploads/1/3/4/9/134904701/nikigi_lijotijozupe_bepage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403807/normal_60437ab56e982.pdfIn PDF document text
    • https://zaketedojerobi.weebly.com/uploads/1/3/6/0/136023974/pofilolupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393349/normal_601e01b54fca9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_604a4de82956a.pdfIn PDF document text
    • https://doselarifiniwa.weebly.com/uploads/1/3/2/8/132814949/joxozo_futudel_suwelagorudi.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/jevejaju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_49573848f86c4aeea10c6ede5aff6721.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_5c291bc90b1847d19b869a60c2f8da76.pdf?index=trueIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_ebff14cd1be041c9b4283e9c60ce2c9f.pdf?index=trueIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_c7e45dbc07744776bead5d897f862de8.pdf?index=trueIn PDF document text
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_9a6e5191f76546a2b3cd2f7bb9744847.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 4852 bytes
SHA-256: 74ef323fa8dec4b1cef9e39d1d822b71e26a59ea6ee4ad08b3213f1b191e4c2c
font_01_sfnt_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 11140 bytes
SHA-256: b2d846387823ca73e74b05629d46146a349fa94f5a99951b6646371160d3328d
font_02_sfnt_off000118a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34