Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4228dd4ef3075d…

MALICIOUS

PDF

79.6 KB Created: 2021-03-14 22:57:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a21e3923f4da1f7ac19aa7995f446d78 SHA-1: 1db928038183791d67c1f313277e260304200759 SHA-256: 2f4228dd4ef3075d98c368adbc1e3e6c84fc6e36bfd112840170d5ccd06becd9
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 0.9991

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://xajibur.ru/strik?utm_term=presto+16+qt+pressure+canner+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465388/normal_600bb4904636e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483338/normal_5fddbdf31fa5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393186/normal_603018c705ee0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370737/normal_5fcd3f0ae91f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421957/normal_603f5a08d0077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485942/normal_603427799e119.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490920/normal_5fdc23ac70cca.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/igWLshf/20320660446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_600c7988c22e1.pdfIn PDF document text
    • https://cdn.sqhk.co/dofofigeniso/Ljdbkhb/waxuriwotatumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443602/normal_604cf37870013.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/hdnjioG/47186986205.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494661/normal_60157459844eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393647/normal_601360b7251b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481278/normal_602ff6c756c06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370264/normal_60415a0fe3b34.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/38877340390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5fd7c2718d3fc.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://muwuvago.atwebpages.com/what_are_the_semiconductor_devices.pdfIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_e83a12448c5849219e996342971265a0.pdf?index=trueIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_580ad03c16824f05be010743174c4579.pdf?index=trueIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_7b1a6bc19ed44d4bad65aa734b1444cf.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 3072 bytes
SHA-256: dbcd417e859a1deada2a3d35641ad3b42b1805b3cefdbad9737b87a80958d55b
font_01_sfnt_off0000eaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 5064 bytes
SHA-256: 312c32ade85a7327d4b69150bdd9c1f34ef9b2efac316bcb4c2b877146118dc9
font_02_sfnt_off0000fbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 11248 bytes
SHA-256: 3bd9dcab94288059713c275b970185e5bae50db05adaac2a6d040de4144a0a8d
font_03_sfnt_off00012223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3