Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7d0d913e7a3292…

MALICIOUS

PDF

84.6 KB Created: 2021-03-31 23:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3760b8986cd9bc2580b2b01ed058e1a0 SHA-1: bd6d7ab5da53b4516f4680a4366805a386341dbf SHA-256: ec7d0d913e7a32925a9a0f34035521d27e6ee00175cdb3296abd60f01aa1ba9d
104 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a large number of external links, many of which appear to be SEO-driven. The document body, though heavily obfuscated, contains text related to 'free download' and mentions 'wkhtmltopdf', suggesting it's part of a link farm or a lure for malicious downloads. The presence of numerous external URLs, including one pointing to 'druttle.ru', indicates a potential attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://druttle.ru/wix?keyword=death+with+interruptions+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/xijodepub/LCjauae/lucky_pusher_win_big_rewards.pdfIn PDF document text
    • https://cdn.sqhk.co/mabisurud/dH5Yhgc/mystical_mandalas_colouring_book.pdfIn PDF document text
    • https://pikarazumubujon.weebly.com/uploads/1/3/1/4/131452816/44ac37722af013.pdfIn PDF document text
    • https://cdn.sqhk.co/sanobude/fCHQgga/gujuzewilaxewezawoxopene.pdfIn PDF document text
    • https://sixagezox.weebly.com/uploads/1/3/1/6/131606695/21ef974b.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/gjb5gic/mercedes_benz_e_class_2018_manual.pdfIn PDF document text
    • https://guvefivilemu.weebly.com/uploads/1/3/4/3/134397682/d572961cc56cf5.pdfIn PDF document text
    • https://woperuxotuxolo.weebly.com/uploads/1/3/4/8/134849923/9956545.pdfIn PDF document text
    • https://cdn.sqhk.co/rabuvimi/cXhiUgg/20976375389.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/itv_tv_guide_rugby_world_cup.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/management_of_brainstem_cavernous_malformations.pdfIn PDF document text
    • http://fububosuvakosal.epizy.com/free_google_chrome_for_ubuntu_16._04.pdfIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_bd0ea1a25bc04cc6b59082872d2ad68e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/ayurvedic_medicine_malayalam.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/tunnelbear_vpn_chrome.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/banner_labels_16_per_sheet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/48773688703.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/multivariate_normal_distribution.pdfIn PDF document text
    • http://rutipozi.epizy.com/informed_consent_form_for_research_template.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_8bc8cfd07e2c4a9784ebd33bd8fca6f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zubata/88416137574.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 5104 bytes
SHA-256: 60202ca6d29254bf3141d86ff522763c36ff21e0ecf0e695a4303981940b942d
font_01_sfnt_off0000f901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 11904 bytes
SHA-256: bb18f5b4568e22f838bda3bf52114c0125700591cd375ebe84571041b4d4f534
font_02_sfnt_off0001213c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213C 16248 bytes
SHA-256: cacce353daa52449aaa2dc03ff14e12d7f37b8e2e541d6bae97b449db5f5a003
font_03_sfnt_off0001368e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3