Malicious PDF — malware analysis report

Static analysis result for SHA-256 749f8f520cdfaf03…

MALICIOUS

PDF

82.1 KB Created: 2021-06-14 20:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e8c2c9fe909b71fa43a641396da98036 SHA-1: f5049d0e8b344fb87b1c5cdf1749f5a79f647a35 SHA-256: 749f8f520cdfaf0357cd2b2a60252420a4f4e1d02ed01ec743f718e8e8f91d64
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 0.9991

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://medvor.ru/pbw?utm_term=stamina+food+breath+of+the+wild PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365659/normal_5fc64b4c6c3bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468534/normal_600a25ec08eb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_603c5da026720.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/vorokukujigevo_dojijokom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462066/normal_5ffd689236abd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403689/normal_602fa419db757.pdfIn PDF document text
    • https://pozusope.weebly.com/uploads/1/3/1/4/131453674/votub-juxezosajibi-zunitotopaf-pisotavewoxome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375528/normal_602e66715ee5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425728/normal_605f33c9e6dcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461516/normal_6054675428a59.pdfIn PDF document text
    • https://demizuxikeb.weebly.com/uploads/1/3/4/0/134000208/8b6e1f9108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414153/normal_603c69f791a29.pdfIn PDF document text
    • https://panelaxefejavej.weebly.com/uploads/1/3/5/3/135306159/jamor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449424/normal_5fc5da59602eb.pdfIn PDF document text
    • https://gujexewemozi.weebly.com/uploads/1/3/1/8/131856271/zojazuno.pdfIn PDF document text
    • https://fojinotumure.weebly.com/uploads/1/3/0/8/130874368/poxexudivono.pdfIn PDF document text
    • https://sigukelerodon.weebly.com/uploads/1/3/4/4/134491686/kikaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480588/normal_604a1528940fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409113/normal_5fec16d40115b.pdfIn PDF document text
    • https://pusesame.weebly.com/uploads/1/3/4/6/134662227/rinovavali_polomeno_bukarurewate_saxuwuso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac03088d-483c-4874-9285-9683c1651b7a/goderifaxajegunate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e267373-10a9-42b9-a46b-cb5514f71956/gofuvototanumobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a42bf8d-6444-403d-b31c-db55cd951cea/camilo_y_evaluna_boda_completa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec5382ba-2529-44ea-82ea-57f33cc03789/xosomunujubivina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08cda3aa-1289-4e9c-afbd-2e24638b8dd2/wekazo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B3 5304 bytes
SHA-256: c43088a024da2a2cad28375742ebb7a3f6bd7ae6fc2b4e2bfcd1b670b55aa034
font_01_sfnt_off000114a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A8 11248 bytes
SHA-256: 4adfa192ded97f708ea69384ef600a889fb759c088a951c33e04f804b99a64bb