Malicious PDF — malware analysis report

Static analysis result for SHA-256 572544d3b563da17…

MALICIOUS

PDF

70.1 KB Created: 2021-05-05 10:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b52ccdd61172a70783c648f861690be2 SHA-1: 55197eea7dec8b76c773efb2e4609a55476560a5 SHA-256: 572544d3b563da1747c6c6ccf877d136ee7ccd35939039726ba09d6721f468c4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://xajibur.ru/strik?utm_term=sunbeam+bakehouse+bread+maker+spare+parts PDF link annotation
    • http://dasezin.getenjoyment.net/botany_notes_for_bsc_2nd_year.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/cRhidhb/tropico_3_vs_4_vs_5.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/jOXsidS/76029552613.pdfIn PDF document text
    • https://teditiwos.weebly.com/uploads/1/3/2/6/132681477/kuxow_nopuniraleb_nulaw.pdfIn PDF document text
    • http://bukupiduge.mypressonline.com/norafowogoxonejamupo.pdfIn PDF document text
    • https://cdn.sqhk.co/tinajugezepi/jfhajdQ/rebovezeberipomajafofodi.pdfIn PDF document text
    • http://wupevijijoze.mygamesonline.org/gazibanikometeluwasesegep.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/goxirigafebikizikakenuxi.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/cpjhhie/49076933844.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/hfjhsjh/suxiwawabexajuweda.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/egibjd4/39066892475.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/at3hbgd/rirosidunovepefododutokeg.pdfIn PDF document text
    • https://cdn.sqhk.co/kitolitik/agKkkhb/cat_evolution_clicker_game.pdfIn PDF document text
    • http://sivesesugipode.scienceontheweb.net/bedejifixuzoli.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/estudios_biblicos_cristianos_en_espanol.pdfIn PDF document text
    • https://kifirazet.weebly.com/uploads/1/3/4/7/134715796/b74b37f5.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/0ggChgy/3536877708.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_53c80a010a7e444aa9be2928b0955463.pdf?index=trueIn PDF document text
    • http://sokekakeloji.onlinewebshop.net/rejikebif.pdfIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_82e2f31b738846d6a7e5a502398652a9.pdf?index=trueIn 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_off0000d1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BB 5472 bytes
SHA-256: 1e156f62b77192e530aad145d7cd533882b782640f91e358d0dff9560eab09b8
font_01_sfnt_off0000e425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 11028 bytes
SHA-256: 305c1d68f1813534b4af6a79aa666c02ec536932e96b0815bf75460406a55e52

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