Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b0bcf3947f9fa9…

MALICIOUS

PDF

78.8 KB Created: 2021-03-24 05:21:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d827af80d5f9d1c5d7d26d7c7377085c SHA-1: d71c7bf3a3446bd8e80c8d7a61c4f7d5879bff6f SHA-256: 27b0bcf3947f9fa96fff4675b4d91d65a63c12c0aa3e3a4ebc360ad46dbd8de4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning and phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, with one pointing to 'http://kakorixow.mygamesonline.org/christmas_carol_fake_book.pdf'. The embedded URL 'https://jacksth.ru/wix?keyword=geometry+proofs+homework+answers' suggests a lure related to academic content to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=geometry+proofs+homework+answers
    • http://kakorixow.mygamesonline.org/christmas_carol_fake_book.pdf
    • https://cdn.sqhk.co/tenalewi/iHDiffU/project_management_techniques_ppt.pdf
    • https://cdn.sqhk.co/gidenateg/yidgcmI/fios_tv_guide_virginia_beach.pdf
    • https://cdn.sqhk.co/jemajujo/WXCWHnq/76227417211.pdf
    • https://cdn.sqhk.co/laruxibut/hnjehco/frosty_boy_ice_cream_menu.pdf
    • https://safamitiwifiro.weebly.com/uploads/1/3/0/7/130739579/tudukiwoxiwozupop.pdf
    • https://cdn.sqhk.co/fegujajox/gg9ieqM/zulomojovugujamagiputo.pdf
    • https://koramuxojenaxer.weebly.com/uploads/1/3/4/7/134701110/linixujiruxuj.pdf
    • https://vifojozajo.weebly.com/uploads/1/3/1/4/131454549/nadepokudaponu.pdf
    • https://cdn.sqhk.co/kojetovukufo/fnKojdQ/98366802976.pdf
    • https://cdn.sqhk.co/xadowififux/hidxalY/mx_player_android_tv_box.pdf
    • http://nupewijanetari.medianewsonline.com/matlab_free_download_for_mac_os_x.pdf
    • http://zugugalepew.mypressonline.com/how_much_is_the_tesla_model_3_performance.pdf
    • https://rejosunofefi.weebly.com/uploads/1/3/0/8/130874376/losujoxotikumejomeva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/satudifin/didej.pdf
    • http://lefumes.rf.gd/fadebaka.pdf
    • http://napubuxuwel.epizy.com/balance_3d_game_for_pc.pdf
    • http://tutedenomazul.epizy.com/34595325469.pdf
    • https://s3.amazonaws.com/jobavo/vodirolidovakowa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f468.bin
a70cb317b12a10cb14a3496e9b4f76355ca3aff3e47565817dfa2d2de18bce28
pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 5400 bytes
font_01_sfnt_off000106b6.bin
55dc379c788bda0a1907144596bc6176a2e8a77e1939336931af09c4dfc1d7b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x106B6 11516 bytes