Malicious PDF — malware analysis report

Static analysis result for SHA-256 25993760caf843fc…

MALICIOUS

PDF

122.7 KB Created: 2021-05-31 23:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4f45ecf7dc56242797af9aa4f7a63919 SHA-1: 77e4cc04b479fa7fe4397f657b24c29b63b43dbe SHA-256: 25993760caf843fcc44f6a74f40263c8aebd1259530efae52385fe043a42efa5
194 Risk Score

Malware Insights

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

The PDF file contains numerous links to external resources hosted on disposable domains, characteristic of a link farm designed to distribute malware or phish for information. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document's primary purpose is to redirect users to malicious sites, potentially disguised as a download for 'Bluestacks portable zip'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/123?utm_term=bluestacks+portable+zip PDF link annotation
    • https://nariwezug.weebly.com/uploads/1/3/1/4/131482968/wubemoniju-xovobum-vetokasa-gebisefazapo.pdfIn PDF document text
    • https://wazivako.weebly.com/uploads/1/3/0/9/130969042/03c0a148.pdfIn PDF document text
    • https://rusijarumeza.weebly.com/uploads/1/3/1/8/131871651/leluzolofa-pexen.pdfIn PDF document text
    • https://wadaletabuj.weebly.com/uploads/1/3/2/6/132695896/kizot_falekivawi_niwelobi_wakejiluja.pdfIn PDF document text
    • https://goxejebifebiv.weebly.com/uploads/1/3/2/6/132682819/5557bd.pdfIn PDF document text
    • https://nizodori.weebly.com/uploads/1/3/4/0/134000204/8479883.pdfIn PDF document text
    • https://kunudixi.weebly.com/uploads/1/3/4/6/134667289/porag.pdfIn PDF document text
    • https://bodupakodekafas.weebly.com/uploads/1/3/2/6/132680796/3774b04c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387235/normal_5fc9f940a708f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375700/normal_606548edc39f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476147/normal_5fd7ec8be43d0.pdfIn PDF document text
    • https://pevigegokepos.weebly.com/uploads/1/3/4/3/134366184/87dbb263a9.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/608698c4-284b-4144-84bf-271d31755659/how_to_connect_dvd_player_without_hdmi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7546519c-fadc-4439-9633-1f7c9afbeb46/penojuzevaluvopozenulop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e633cdcf-2cb7-4062-b0e8-a0532b0d0e30/3439396523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c1e4e5b-dffa-4e85-8e6d-074e84c54156/dumaxamanomijazawaginidir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c68ebdb9-6af3-4669-9554-dd954b0aeadf/2pac_-_changes_official_music_video_ft._talent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f5636fc-94ba-419f-836f-5b8e18816862/sixebunejifineguwatidule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2767a7c2-c4f6-4553-ac7f-ac99dcfb6fab/innovo_change_to_fahrenheit.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_004_off0001aa9e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1AA9E 21700 bytes
SHA-256: 70cde35e4c5593a117dd960b6cc31d5fe5054599b1d1aae6da29bb472b52b51f
font_00_sfnt_off000167d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167D2 5004 bytes
SHA-256: 4e285be445a5b92e6a6855c3be6f62a5aaacf5e4aa45f894ba7e8af0ae4a03a0
font_01_sfnt_off000178eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178EB 16020 bytes
SHA-256: 6d690768046a1e82af2d06e15215157c8236f105caf35280efa13e4991f6c27e
font_03_sfnt_off0001cf7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF7F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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