Malicious PDF — malware analysis report

Static analysis result for SHA-256 235ea6ce376fa231…

MALICIOUS

PDF

86.2 KB Created: 2021-06-09 15:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 80013a95f1130b8bfbbdadf7dd23c599 SHA-1: ec649d0efccd1571b5e598945f041da2e1102789 SHA-256: 235ea6ce376fa23145b5e55980d7ddbb78d438c35dcd3880ffe19f37b8892bf8
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The presence of a 'download' button lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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.
  • 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://archism.ru/pbw?utm_term=mini+military+apk+mod PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459788/normal_5fcbf5f0d4e27.pdfIn PDF document text
    • https://gezameluloxeg.weebly.com/uploads/1/3/5/3/135393377/dumedarov_monurupex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471275/normal_5fe5e9fde9f5f.pdfIn PDF document text
    • https://bixoriwapavam.weebly.com/uploads/1/3/4/7/134731951/3256154.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373770/normal_60041c8f568fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_5fd2471eb6320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495385/normal_5fd6a4181c4b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411932/normal_6065f3b2aa593.pdfIn PDF document text
    • https://xizovetezewo.weebly.com/uploads/1/3/2/8/132814166/zumunabexipafi_tojamapupemukat_lotodul_sibavoxeki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454432/normal_604a7cc1a9456.pdfIn PDF document text
    • https://jetefodakulerur.weebly.com/uploads/1/3/1/4/131453332/wokitarex_pavenakiwu_suvosulodam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475217/normal_600bf4aa02d09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530846/normal_603896a5f008e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4408866/normal_60b017838ec20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475864/normal_60211177b59bc.pdfIn PDF document text
    • https://tufubigin.weebly.com/uploads/1/3/1/4/131453284/2079333.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376357/normal_5fcefa42d4208.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458635/normal_5fcda81aa23d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415937/normal_606e982b43dbe.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://gepefupugalu.pbworks.com/f/difference_between_ct_scan_and_scanners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a053673c-540e-4dd0-bac3-59eeafe387ac/nifebokomum.pdfIn PDF document text
    • http://zewalar.pbworks.com/w/file/fetch/144603636/how_to_check_serial_number_in_linux_by_commands.pdfIn PDF document text
    • http://jowenoxo.pbworks.com/f/how_do_i_change_my_airprint_printer_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bc1b849-6793-482a-98ed-c36cb40e7203/watch_detective_pikachu_online_123.pdfIn PDF document text
    • http://gulisapil.pbworks.com/f/how_to_write_daily_progress_report.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144422313/public_administration_books_for_upsc_optional.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 4768 bytes
SHA-256: ca085fb9d99c7fc9866428926e896a6ff9dacacfdf6d1ebbf9739776621c9da9
font_01_sfnt_off000117ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BA 10872 bytes
SHA-256: ad8593e9590ad4fce789dbdd4a7ffc25d644835215720d359f5462d6a5e8bddd
font_02_sfnt_off00013cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176