Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc70b83128683ca2…

MALICIOUS

PDF

75.5 KB Created: 2021-04-14 21:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8877ba5a98236f194b50c2bef6638470 SHA-1: 2773d6e698a4377a436a6208e3cc848119432f9d SHA-256: bc70b83128683ca2b91a252f2add21b6b49f01e90814c9cc9f36c33ae92e1317
292 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple critical heuristics, including ClamAV detection and ML classification, indicating malicious intent. It contains a mass of external links, with one pointing to known malicious redirector infrastructure. The document also employs social engineering tactics by presenting a fake download button and a lure to install a browser extension or update, aiming to trick the user into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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
  • 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://crophysi.ru/strik?utm_term=pack+n+play+walmart+calgary In PDF document text
    • https://xipasole.weebly.com/uploads/1/3/4/8/134853136/a242a3d5a5.pdfIn PDF document text
    • https://giximelet.weebly.com/uploads/1/3/4/2/134234701/9574503.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/hgjfEja/pdf_annotator_free_portable.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/FZjioja/43301404663.pdfIn PDF document text
    • https://cdn.sqhk.co/gapalagabig/ezy4jh3/18148519449.pdfIn PDF document text
    • https://cdn.sqhk.co/nulupitet/ughzgiQ/30585266922.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/ifijdy4/topitugemezepejabi.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/HhjsGih/nopabagafigizekeb.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/jjie50y/usher_latest_songs_2020_mp3_download.pdfIn PDF document text
    • https://cdn.sqhk.co/terodekijur/hbD8cgj/40832780451.pdfIn PDF document text
    • https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/xiduzalowakevuwi.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvidomanale/gIiieha/dejejiturotuwabaxuzu.pdfIn PDF document text
    • http://zazerure.22web.org/private_practice_cast_season_3_episode_4.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzixije/0gdgdgd/44014456157.pdfIn PDF document text
    • https://cdn.sqhk.co/nubavojek/aL5CAhc/wumenokixikaj.pdfIn PDF document text
    • https://cdn.sqhk.co/wejupexuput/hhiiicX/centurylink_corporate_email_address_format.pdfIn PDF document text
    • https://cdn.sqhk.co/fomolunuvufa/fQQ52jg/75142762573.pdfIn PDF document text
    • https://cdn.sqhk.co/dubibuwa/hcnbghj/juzovodibewaku.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/perurulexi/66156220776.pdfIn PDF document text
    • http://mesuwirafifi.rf.gd/77267544291.pdfIn PDF document text
    • http://muvusibose.rf.gd/xonajufipegijoribikomaku.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/how_to_do_circle_theorems.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/15306382507.pdfIn PDF document text
    • http://gewagopixinilu.rf.gd/dikulukipipoka.pdfIn PDF document text
    • http://filazit.epizy.com/78995665705.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/which_rice_cookers_are_made_in_japan.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE679 5336 bytes
SHA-256: fdf2ae982069af5ff1be0bca2637aca713e646e30ac2d8c0a05af2ca3cad1397
font_01_sfnt_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 11600 bytes
SHA-256: 633b2f4f48cd943d67d2aec0758eac55e9e41a6b2bf7709916767d6d02da004f