Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b9fc895cab1fbf…

MALICIOUS

PDF

75.7 KB Created: 2021-03-11 14:03:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52bcba338e529d286c8a7f38f86d1ef1 SHA-1: a7bd7e8baf2cfe62cc77031ddb583340f756ba09 SHA-256: b9b9fc895cab1fbf134fc0befe447acfda7a22fc30a9e3f1533c0fdcaf4dc438
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. The primary URL, 'https://golowaki.ru/award?keyword=ncert+mathematics+textbook+for+class+11+pdf', suggests a lure related to educational materials to redirect users to potentially harmful content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/award?keyword=ncert+mathematics+textbook+for+class+11+pdf
    • https://cdn.sqhk.co/wedifedaguju/dhrifZs/582403332.pdf
    • https://cdn.sqhk.co/xefilelo/sjeQig5/mci_airport_rental_car_return_directions.pdf
    • http://loxesitigogu.iblogger.org/burning_series_kostenlos.pdf
    • https://cdn.sqhk.co/lebogomatoze/3jcqxDY/bitemobekuletuvori.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/81c2061a-9868-45b2-b525-47a8f1e92462/pain_after_cortisone_injection_for_tennis_elbow.pdf
    • https://s3.amazonaws.com/jevopemosod/9218169079.pdf
    • https://s3.amazonaws.com/folexapurilowe/bilalojurobuzosepatazotur.pdf
    • https://uploads.strikinglycdn.com/files/6ac9b121-5be0-4ee5-9bf2-322a9fc2a047/15695747173.pdf
    • https://uploads.strikinglycdn.com/files/f49ed61c-a507-444d-98ff-ccf445e5dbbb/52627472222.pdf
    • http://jiboleramar.epizy.com/react_design_system_template.pdf
    • http://kegunujav.epizy.com/superannuation_standard_choice_form_australiansuper.pdf
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_e6ad31d02cad402ab92466de458652cd.pdf?index=true
    • http://navezep.epizy.com/11238601365.pdf
    • https://uploads.strikinglycdn.com/files/73939f10-1086-4a22-bd74-5686c3a994c7/why_halogens_show_colour.pdf
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_9c230e4310b7421293dec82dfe00313b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3a6216a3-00aa-48fa-9186-2aaa21c9518c/mayan_numbers_to_1000.pdf
    • http://zozozixub.rf.gd/cheat_sims_mobile_android_indonesia.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_off0000e976.bin
74abeaf819185929a118afb4f2cb22bc6a119b724a5ca7c87a4866d7e265b369		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 5688 bytes
font_01_sfnt_off0000fcab.bin
f39413797c3f2d63eb7063f85e22d870792e7fbe5785277c3045df2c8f730e85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAB 10732 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.