Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c62239c21218d2…

MALICIOUS

PDF

77.5 KB Created: 2021-03-18 03:08:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4a79414267f513d9c49c851513106cb9 SHA-1: 5eb1909601c4df30d340cc71883a4759f837f148 SHA-256: c4c62239c21218d20cd5280faf8db00a3c161faddb5c2d11dd999a97e7b9fc23
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains heuristics indicating it is a malicious link farm, specifically designed to lure users with payment-related language. The embedded URL, https://zajinet.ru/strik?utm_term=what+does+usps+pay, is a primary indicator of this malicious intent. While no scripts were directly extracted, the ML classifier strongly suggests malicious behavior, likely involving the exploitation of a PDF vulnerability to redirect the user to the linked site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://zajinet.ru/strik?utm_term=what+does+usps+pay PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410414/normal_60523d692e5a6.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/74461830800.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444644/normal_5fca6c01cc39a.pdfIn PDF document text
    • http://makamar.tech/29445445372t068v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372371/normal_5ff4bbe29bb6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385021/normal_60199d1f3348d.pdfIn PDF document text
    • http://istlan.space/jerisofezulanagosuwebtv7m8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415769/normal_604167474f293.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450003/normal_5ffb3430bbfcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453144/normal_601f2ca797a63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_60446bef6be55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_04ed02f614e84917819c7b298dd9477c.pdf?index=trueIn PDF document text
    • http://tipipigi.atwebpages.com/biebl_ave_maria_ssaa.pdfIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_5dce6600e49643ba8a043aced3b19128.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_5ec9ae54944d4f0ca45819677f554d21.pdf?index=trueIn PDF document text
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_f33dbcc81a7840cbb170807de78f0f67.pdf?index=trueIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_c585937a5f304bf79760adb08cb527bd.pdf?index=trueIn PDF document text
    • https://755d026c-fd58-4633-9ca9-8af24261f473.filesusr.com/ugd/4622eb_0bcecc0961e2427faf00ba88e75afcc0.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 5036 bytes
SHA-256: df2aad7be52d4ff2313c9592a5e51e5bc0e96740c54c185efeaece071bf8477d
font_01_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 11108 bytes
SHA-256: 51419318588041c2c86f5e320f012cf5fb08f136498342b23e3dc5c9d0ab86b6

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