Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f8e8bffd36f18e…

MALICIOUS

PDF

113.2 KB Created: 2021-02-09 12:22:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 14398feec240b6faee6f8b034d81a846 SHA-1: 6c9819f6caf0e3f8468ac1bb5ec516b0d1e881b1 SHA-256: 72f8e8bffd36f18e492977f00a7b5a47e80ea8559bf6167bc090f4ba14551a90
246 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to obscure the ultimate destination. The 'SE_BRAND_CREDENTIAL_PHISH' heuristic firing indicates an attempt to impersonate UPS for credential phishing, directing users to a redirector URL. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely involving the redirection of users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://xoburorabusu.weebly.com/uploads/1/3/0/7/130738623/198180.pdf.
  • 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://seumenha.ru/aws?utm_term=australia+visa+application+form+for+nigerian PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376126/normal_5fefe6a66360d.pdfIn PDF document text
    • https://xoburorabusu.weebly.com/uploads/1/3/0/7/130738623/198180.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/id8Tr3a/online_multiplayer_games_with_friends_pc.pdfIn PDF document text
    • https://dezegumi.weebly.com/uploads/1/3/4/1/134108828/rusewotik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417123/normal_6015cdf436310.pdfIn PDF document text
    • https://bumesusibob.weebly.com/uploads/1/3/1/8/131857970/8131993.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404107/normal_600648326e186.pdfIn PDF document text
    • https://vibofigejud.weebly.com/uploads/1/3/0/7/130740502/a34d0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489428/normal_6012785333f75.pdfIn PDF document text
    • https://raxuzorozejataw.weebly.com/uploads/1/3/4/0/134042373/ad75069bcf98.pdfIn PDF document text
    • https://binenivav.weebly.com/uploads/1/3/4/5/134516867/vasigil-natixowa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426572/normal_5ff0b2cd24614.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/hhhePyB/surazu.pdfIn PDF document text
    • https://rabuwamefikulo.weebly.com/uploads/1/3/1/3/131398373/5097120.pdfIn PDF document text
    • https://totorososine.weebly.com/uploads/1/3/4/8/134892144/jesaborat.pdfIn PDF document text
    • https://jexafowasefuxuv.weebly.com/uploads/1/3/4/5/134588667/daroma-dabadokixi-guvud-gotosufifilod.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/jajcjaS/tachyon_technologies_glassdoor.pdfIn PDF document text
    • https://bokoxopeke.weebly.com/uploads/1/3/4/2/134266118/f6db60c0a80fe09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383582/normal_5ffd417adbbeb.pdfIn PDF document text
    • https://lojexidipiwakif.weebly.com/uploads/1/3/4/0/134041559/silitubojamenume.pdfIn PDF document text
    • https://vutuzanepe.weebly.com/uploads/1/3/1/4/131453188/05b55301c70.pdfIn PDF document text
    • https://cdn.sqhk.co/joremeve/hYidijI/66953387707.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00017b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B14 5384 bytes
SHA-256: 39078873f266b1b5fc74fbee32598d11d11a3821e0c99f05d47ca5d2508b7b1a
font_01_sfnt_off00018d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D5D 12528 bytes
SHA-256: 3168475a5c26ba4e348a50fa0dc9882dd78b01f160eff2c6480706bfb6036394

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