Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55987a7b711ad5a…

MALICIOUS

PDF

73.0 KB Created: 2021-03-28 16:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6a96d56f19db59ed76bb98b910626e4a SHA-1: 0aa4fdc63e798ca3e36fb2d2261fdb25230ee93d SHA-256: e55987a7b711ad5ad7f43c7802a6cbb789a6db87082f0891d418614f6e33f0ff
214 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://yafferge.ru/award?keyword=flight+of+the+bumblebee+easy+piano+pdf In PDF document text
    • http://lajafago.medianewsonline.com/jiwogumuruzuxatof.pdfIn PDF document text
    • http://rezumitisud.mygamesonline.org/sexuzirebud.pdfIn PDF document text
    • https://remanajuzox.weebly.com/uploads/1/3/1/4/131437778/2761513.pdfIn PDF document text
    • http://wudebakafepi.mypressonline.com/befeditotidop.pdfIn PDF document text
    • https://tonaroxaz.weebly.com/uploads/1/3/5/3/135317799/wasowe-nililerefabodaw-kebesa-memukefi.pdfIn PDF document text
    • http://tebapewulodafe.getenjoyment.net/duwumuvemudep.pdfIn PDF document text
    • https://vebeviwikime.weebly.com/uploads/1/3/4/3/134317270/1939044.pdfIn PDF document text
    • http://fuxutigox.mypressonline.com/6494496331.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xilereguf.rf.gd/cabinet_ministers_of_ap_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/what_is_i_love_you_in_all_languages.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/varicose_veins_in_pregnancy_rcog_guidelines.pdfIn PDF document text
    • http://kesupipipiret.onlinewebshop.net/liturgical_seasons.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/61923182130.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/cambria_math_bold_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/magic_mouse_2_10.10.5.pdfIn PDF document text
    • http://rulamiji.onlinewebshop.net/english_conversation_for_class_10.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/rustoleum_cabinet_transformations_white_walmart.pdfIn PDF document text
    • http://kaloruligot.onlinewebshop.net/miwaximobekezilu.pdfIn PDF document text
    • http://kavezusi.onlinewebshop.net/10256207836.pdfIn PDF document text
    • http://misebupafavo.rf.gd/vpn_free_apk_best.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_off0000dcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 5556 bytes
SHA-256: 7a810d8be67d821fef6c72e6b88c00739e1ec118a1208b716c2278d1b1749415
font_01_sfnt_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 11676 bytes
SHA-256: 59e23c0338617930f276e19a3c840e14151b895de8315af40a6230e04cb78dd0