Malicious PDF — malware analysis report

Static analysis result for SHA-256 64490d0610c2ec6c…

MALICIOUS

PDF

77.7 KB Created: 2021-02-27 08:31:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 07879f5e48766f7f63822975bf62b93f SHA-1: 7e6da88a0479cda6bc4a41d2cc2aed366308c6b8 SHA-256: 64490d0610c2ec6cfeb6a9ad9b62f11081a6fde4b84b12b117e2a6fac56fbc9d
154 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for a PDF link farm. It contains numerous external URLs, with a primary focus on https://druttle.ru/award?keyword=sounds+better+than+meaning+in+urdu and a large number of other PDF links hosted on services like weebly.com and cdn.sqhk.co. This suggests a campaign to generate traffic or distribute malicious content through SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9668

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/award?keyword=sounds+better+than+meaning+in+urdu PDF link annotation
    • https://dubitofux.weebly.com/uploads/1/3/4/4/134458445/35fd471d93049e.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/1vp6qji/52037529597.pdfIn PDF document text
    • https://cdn.sqhk.co/zofonabiz/qwhchgc/56998685334.pdfIn PDF document text
    • https://cdn.sqhk.co/fusaduxuw/gckjefK/63923783351.pdfIn PDF document text
    • https://netulomite.weebly.com/uploads/1/3/2/8/132814473/mapag.pdfIn PDF document text
    • https://cdn.sqhk.co/fiziroluj/eyihhgU/followers_times_for_instagram.pdfIn PDF document text
    • https://gomamuna.weebly.com/uploads/1/3/5/3/135304292/6770205.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuxuvop/Bgi9S5i/stick_hero_fighter_apk_mod_1._1._4.pdfIn PDF document text
    • https://mopuvavipobum.weebly.com/uploads/1/3/1/0/131070525/3960980.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/information_about_zamboanga_sibugay.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/soxel.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/24604813495.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/34779196794.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/fema_ics_field_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/angular_formarray_formgroupname.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/ieee_reference_style_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/sajikoduwokuvirofax.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/31243779934.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/8641677512.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/solewofujapebibumo.pdfIn 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_off0000ffdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 5452 bytes
SHA-256: 04e3d2ad8c9532acea575f7fdf61d30e29d17731cd7d90ba4fbccc9b48570884
font_01_sfnt_off00011230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11230 11956 bytes
SHA-256: f28920d55775933d7c3fc0ca4dc772f82241cd40eb2d2b077e74f7a2fc624999

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