Malicious PDF — malware analysis report

Static analysis result for SHA-256 355424ae8ade0cfc…

MALICIOUS

PDF

91.5 KB Created: 2021-04-03 01:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b414bcbb940c4b5688c87af0ae1ff5b5 SHA-1: 53d9ecbb980f95133a05321479fc2120fd3e2313 SHA-256: 355424ae8ade0cfc4261b43056c0309a14b19ad784bd743f5963ea681865c0a5
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 0.9990

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://pelibifir.ru/strik?utm_term=what+is+the+best+brushcutter PDF link annotation
    • https://cdn.sqhk.co/wofutajo/HhcdoNB/29509427895.pdfIn PDF document text
    • https://dumidonawusirug.weebly.com/uploads/1/3/5/3/135306770/8fb2d1.pdfIn PDF document text
    • http://pevewoxoxup.scienceontheweb.net/tsc_appraisal_form_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/vukixukafoga/aghdhgk/6032804708.pdfIn PDF document text
    • https://cdn.sqhk.co/rudolikube/gjcRaJ9/street_racing_3d_download.pdfIn PDF document text
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/0847a1.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosudav/gegdyhg/95546038476.pdfIn PDF document text
    • https://serutoposax.weebly.com/uploads/1/3/5/3/135398922/kapokib.pdfIn PDF document text
    • https://susejovidexoxi.weebly.com/uploads/1/3/0/7/130775922/kuzil_dazozivo.pdfIn PDF document text
    • https://ledegukumimajem.weebly.com/uploads/1/3/5/3/135393042/libomuf.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/hgiii2a/majesty_the_northern_expansion_apk.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
    • http://dasobiviwadodaj.atwebpages.com/31576575797.pdfIn PDF document text
    • http://kafotafuvodalix.onlinewebshop.net/nikumozoputubosobodapo.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/83378282423.pdfIn PDF document text
    • https://3012fa3b-51b7-4264-898e-e15d6fab1eb1.filesusr.com/ugd/ee5524_cb3a33c93a5d423a9efb9e6d98d01a4a.pdf?index=trueIn PDF document text
    • https://6dca1d0c-b102-4aa4-a312-d013f97c39dd.filesusr.com/ugd/fb87fb_f789343ec53d45a1bc3a4022ad373b14.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/kidesafagiwuloboz.pdfIn PDF document text
    • http://raxegujanamefas.atwebpages.com/maredosolefatuwavi.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/79542168453.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/dozanegepivijuveta.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_617e698882c14a5a8530c99b9696f107.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/pagirexane.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001097a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097A 4672 bytes
SHA-256: c4e084c7eba08dba684087d33c45a36a59860af89e74abf26125a4f40064146d
font_01_sfnt_off00011976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11976 10380 bytes
SHA-256: 834628f8535a917164ad764d973d6ac15509ec24f53f9a720bb9304b71851ee5
font_02_sfnt_off00013cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF3 16076 bytes
SHA-256: 1882111c93182885355c326966aa8b929451d516289c4c69bffbc3e8f6f639a9
font_03_sfnt_off000151a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A1 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c