Malicious PDF — malware analysis report

Static analysis result for SHA-256 2312172554457157…

MALICIOUS

PDF

83.5 KB Created: 2021-03-19 13:53:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7e139e388c59ed729530f7cce67ddbef SHA-1: 67f2a30531088cda11dbd42f81f940482d69faac SHA-256: 23121725544571578bc9acf3f37fd62915ac68a461c37ab5de4e235659bffa69
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on directing users to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of 'offer up apk file' in the document body suggests a lure for potentially unwanted applications or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://mezovuduw.ru/123?utm_term=offer+up+apk+file PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370285/normal_6015aaec2e5e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453537/normal_6011dfe332a19.pdfIn PDF document text
    • http://sendgrid-de.com/moropabilowidifajc0na.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/403954777652rkj1.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/ieWjdje/ullu_web_series_mx_player_mirzapur.pdfIn PDF document text
    • http://laludinemolat.sportsontheweb.net/afcat_2_question_paper_2020.pdfIn PDF document text
    • http://duwudivusupo.mygamesonline.org/davetara.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/77249269192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424328/normal_601a776e8beb0.pdfIn PDF document text
    • http://canonsburglake.org/48692770784k84rk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443821/normal_60296d704451e.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/DoSejaU/netimilezogigatuwil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418013/normal_60037a207f693.pdfIn PDF document text
    • http://smirno.life/680325025678yz20.pdfIn PDF document text
    • http://jolovomolosubi.getenjoyment.net/sowibinomunudovir.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/badminton_rules_2020.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://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c78e9cf-945a-40ae-8e25-9089af04f94e/54071269778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81a9cdf-a4a0-4172-b276-6e1daffed19b/8645702939.pdfIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_bd54020a5daa482192da70c8c38fc073.pdf?index=trueIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_23bc21a08cb14186b2d9f4cc09dfda6d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f27592ef-b93b-4a95-a16c-8b995762ebdd/lenovo_t510_ram_max.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F9 4396 bytes
SHA-256: c68a005ef9fd97264e607f834e95fbcf86701cd9fb4c98c5ff44517a24e1894e
font_01_sfnt_off0000f1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FE 13320 bytes
SHA-256: 561545a75ea1dc06238c1a41491f9b5a022c55053f7a7c4c89ef485394aef90a
font_02_sfnt_off00011bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCC 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
font_03_sfnt_off000129cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CD 6432 bytes
SHA-256: 86c7811ad7cbc20cb3421b5968be4200f2bc1f697f8385e9c54fbda997a1acf0

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