Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ab5c4b15a7eb3b…

MALICIOUS

PDF

80.3 KB Created: 2021-05-30 02:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8b9a4174267289d1345f9881f6c7fc2f SHA-1: 91fcc9233c5ccb7dc1507e592cec864463c791c0 SHA-256: 57ab5c4b15a7eb3baeaf2482579412e289c19d454372376b5e9e6bf98da59a85
194 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://gimoguvi.ru/strik?utm_term=boy+scout+merit+badge+pamphlets+online PDF link annotation
    • https://zesujejiviwi.weebly.com/uploads/1/3/4/7/134729849/876d115835.pdfIn PDF document text
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/da9d8576aad7.pdfIn PDF document text
    • https://sazotavivi.weebly.com/uploads/1/3/1/1/131164406/zorov.pdfIn PDF document text
    • https://tadeganerusoza.weebly.com/uploads/1/3/1/4/131438541/vurun-sejogukukiro-mosegapixigeb.pdfIn PDF document text
    • https://xevogivuzu.weebly.com/uploads/1/3/5/3/135350373/2873511.pdfIn PDF document text
    • https://nowitapa.weebly.com/uploads/1/3/1/4/131438176/tofinefi.pdfIn PDF document text
    • https://jurizimobijagi.weebly.com/uploads/1/3/0/8/130874317/xufabepowuxovafapivi.pdfIn PDF document text
    • https://rikomurisixub.weebly.com/uploads/1/3/1/4/131454733/belapizelegin.pdfIn PDF document text
    • https://pimedoxeniku.weebly.com/uploads/1/3/4/6/134640330/624400.pdfIn PDF document text
    • https://zobimodajozo.weebly.com/uploads/1/3/4/3/134340865/e9a419d.pdfIn PDF document text
    • https://zuseluxutiv.weebly.com/uploads/1/3/4/6/134686448/kekopivo-tuxosorom-likofalotuk-fenuvidipuxuwu.pdfIn PDF document text
    • https://kogavoduwesexup.weebly.com/uploads/1/3/4/6/134600755/9c0b0d7d64490.pdfIn PDF document text
    • https://fitovaturi.weebly.com/uploads/1/3/4/3/134371738/2cfc3de849051eb.pdfIn PDF document text
    • https://nupadosizekibu.weebly.com/uploads/1/3/4/5/134597568/9798245.pdfIn PDF document text
    • https://vulajavup.weebly.com/uploads/1/3/4/6/134683256/tepugetepuxemuvefo.pdfIn PDF document text
    • https://wisukemebo.weebly.com/uploads/1/3/5/9/135962546/606356.pdfIn PDF document text
    • https://tusilagel.weebly.com/uploads/1/3/0/7/130739454/tutona-jaludu-vimipi-dekiliwaxupet.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4375357/normal_60b0478c991f0.pdfIn PDF document text
    • https://ziperivowupidu.weebly.com/uploads/1/3/1/3/131381589/vipemuwiwixul-fezavow-jemutadepebawob-likos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388405/normal_605cf61fa57d2.pdfIn PDF document text
    • https://bagugesi.weebly.com/uploads/1/3/0/7/130775983/radisefifijoxivufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_605f0cf632fda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446492/normal_5ffada6913432.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473049/normal_5fe2457bd168e.pdfIn PDF document text
    • https://riwubabefos.weebly.com/uploads/1/3/4/5/134591520/buvawoxov.pdfIn PDF document text
    • https://kimilofu.weebly.com/uploads/1/3/0/8/130873947/wibaxo_xipas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 5780 bytes
SHA-256: ae4cbbbf2feb15e8ef9a2a360a64849ebf670a69e6f9a610c3f9762aa30c9e58
font_01_sfnt_off00010a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A45 11648 bytes
SHA-256: be17176b051ff115d6c3fc361a43d96280c650252cf13613e9a2469b335852dc

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