Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a5a0f0a2e5eda4…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 19:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fdd065805febfcbc20ce45eb79b72cef SHA-1: 8c1ad8068acbd3406605151bbff0ef566da4e678 SHA-256: f1a5a0f0a2e5eda45bde6452934e5de7c7e39afda545a0b46734fd0c2135d4c3
134 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious download lure, likely using JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 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/uplcv?utm_term=baseball+superstars+mod+apk PDF link annotation
    • https://yukkumpulgroup1.com/contents/files/81670045299.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/52709077750.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/42191272175.pdfIn PDF document text
    • http://zatacorp.com/upload/files/27089284754.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/zeneluvulolibafifuz.pdfIn PDF document text
    • https://mimpishio.com/contents/files/gikobuna.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/gemiwuwewosotad.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/muripon.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/zexefawu.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/22716449940.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/2e1b2ae0e935d8264683ceb402d938f5/76546418764.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/11633293639.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69507144658.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/fimugozawivabivagadosa.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/saninugujugume.pdfIn PDF document text
    • http://villkasz.hu/editor_up/fopuvorizukorasixofoxo.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/23975703835.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/37074392290.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/87896508691.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/numorawuparamifevopig.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3fb2b8e7b---winepowufenumulemu.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/lutitugifevediwixufe.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/61429752856.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/94085733129.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/wusuvizujadazumuduxeniwu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE41 10744 bytes
SHA-256: b51b74c72aa6cd7af8c28181118dadbbb6ed2e774b3794e95a7fd1e7284cd02f
font_02_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 17896 bytes
SHA-256: 253df9c4b7cef6b33911390cb5e12a42c4f934eb817f6042bc866e454f164774