Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81de96d37592c92…

MALICIOUS

PDF

74.8 KB Created: 2021-04-25 05:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b33911cc0555a7f1b48bfe4747979f78 SHA-1: 9ece8bfcad8e7c5910451de1d5f3a7c60fe096db SHA-256: f81de96d37592c92d9c10d908f3245f0b59a7f062ee711e4df5747f951a34db8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDF files hosted on Weebly and other platforms, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

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://jottigo.ru/strik?utm_term=cat+phone+s61+not+charging
    • https://buvawaxeve.weebly.com/uploads/1/3/0/8/130874113/8bad6.pdf
    • https://xokosawebajufad.weebly.com/uploads/1/3/0/7/130776850/duruwud_tofizozeti_wemufifake_rogiwi.pdf
    • https://cdn.sqhk.co/wesifarajaru/jfkB5ib/space_racing_2_mod_apk_happymod.pdf
    • https://cdn-cms.f-static.net/uploads/4465543/normal_5fdb5f96cf92d.pdf
    • http://puwisagoki.22web.org/how_to_write_english_sentences_using_verb_tenses.pdf
    • https://birobidusizal.weebly.com/uploads/1/3/4/6/134638138/zuziwivuzolilemu.pdf
    • https://benevegavevu.weebly.com/uploads/1/3/4/5/134501748/sirovadinit-weverozeboxo-xopesadususu-sobona.pdf
    • https://cdn-cms.f-static.net/uploads/4416666/normal_60433d5775eb4.pdf
    • https://cdn.sqhk.co/mojekuvugise/ajfihXq/bixaxegozogesazaweverut.pdf
    • https://cdn.sqhk.co/zilidadakole/fqibSje/download_streamer_life_simulator_mod_apk_android.pdf
    • http://fogazino.iblogger.org/angularjs_form_action.pdf
    • https://jejusutib.weebly.com/uploads/1/3/0/7/130740078/5b75316e645fd8.pdf
    • https://vuxamirajuka.weebly.com/uploads/1/3/6/0/136082549/7697909.pdf
    • https://cdn.sqhk.co/noperizapewo/AK3ihgj/guguwivabinawobupadadu.pdf
    • https://xizuzumuk.weebly.com/uploads/1/3/2/6/132682261/bakaxunuduzawomeji.pdf
    • https://cdn.sqhk.co/zazifutunoj/vhjjdjh/lego_ninjago_masters_of_spinjitzu_sets.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sepobifesedapeg.rf.gd/suporizukisi.pdf
    • http://bikikifuxax.epizy.com/toromotalugusob.pdf
    • http://fuxodenajakifut.epizy.com/advanced_language_practice_answer_key.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_off0000e6ad.bin
fe119805ce818c51c06e0dcd1ac937745a0168295800df86f5154cf83a108b80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AD 5276 bytes
font_01_sfnt_off0000f898.bin
6cefd76e534b5d761bd57f5e979132a252ead6e22bfd5451bcb54efdf6f16831		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 11076 bytes

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