Malicious PDF — malware analysis report

Static analysis result for SHA-256 870df66db1c269f4…

MALICIOUS

PDF

110.5 KB Created: 2021-03-09 01:55:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 03c6731e81033bbd7ab3270f5a0d1916 SHA-1: 8a9c91275f6b5b4df9f2d0aa8b6de66db26d09d4 SHA-256: 870df66db1c269f4bff89867564b8b7c2ceddb864b0c1bb2e19bfb589768e3dd
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. One prominent URL, 'https://zajinet.ru/strik?utm_term=philips+system+one+change+pressure', appears to be a redirector for a phishing campaign. The document body is heavily obfuscated, but the presence of numerous external links and the heuristic 'PDF_SEO_LINK_FARM' indicate a malicious intent to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://zajinet.ru/strik?utm_term=philips+system+one+change+pressure PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412896/normal_601314e11daa8.pdfIn PDF document text
    • https://wujibinofowe.weebly.com/uploads/1/3/1/3/131383737/7068625.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/the_daily_trading_coach_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375342/normal_602ce95c6bb25.pdfIn PDF document text
    • http://ruxenawuxovogu.getenjoyment.net/noxagamapugag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490920/normal_6007be87cbaff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378405/normal_60446f1e69cad.pdfIn PDF document text
    • https://gawajofanobovap.weebly.com/uploads/1/3/5/2/135296378/refabej-dopasavesu-kabefisekodonel.pdfIn PDF document text
    • http://ramuwesitavoz.mywebcommunity.org/34636947240.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387427/normal_5fc9279803038.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
    • https://uploads.strikinglycdn.com/files/ce5dd471-eb8a-4542-ae7a-1ab849ecdee2/90452343150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11f4e400-ed54-461b-873c-949fbfb44224/read_the_red_queen_series_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56756425-ac8f-403d-ae74-dae8db524530/york_stellar_plus_furnace_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25e19c2d-a7e9-4150-8c0c-e4e77bc18dfd/deburagadare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/553a44ce-6f8a-44b7-be08-a53c5ba3aa95/is_pa_school_worth_the_debt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d66d5e3a-bbdc-4bd9-acda-90d34d4457d6/oa_grey_sheet_meetings.pdfIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_fa7e74e04bf4485fa3b85766a2926984.pdf?index=trueIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_57569e5f30bc43aeaca8e031f8c59cc1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d93b748-d85f-482a-98f4-b98f01abed29/classical_gas_tab_ukulele.pdfIn PDF document text
    • http://lojubefogugiku.onlinewebshop.net/mifuzunotowalafasotibagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f683ba6-4c18-4b9b-878b-f378343e5ce8/58895692374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf9a38d6-b6cc-45cb-af55-30689e242f67/wuxefozob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ee1ef8-9469-43f1-baf4-9e2dbcd1790a/89869547283.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00017087.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17087 25004 bytes
SHA-256: b27433fcb1593d2a7e04d2ca129e038dad69bbd13b3263ee6825ab6d08b8e855
font_00_sfnt_off00013836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13836 5332 bytes
SHA-256: df47e090ac6e8a16e495519f41979a7faf475e09f8680ce5aa29ca09ca6780ae
font_01_sfnt_off00014a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2A 11268 bytes
SHA-256: a5d318386aa366a6495971e429618a85424176ef0222d8c17531e82e3c4c09d3
font_03_sfnt_off00019bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BD5 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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