Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b59f045276aa77…

MALICIOUS

PDF

81.8 KB Created: 2021-03-28 07:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cda1c98b15c93346aef9c739a03854ff SHA-1: b529c83ae4d2ea8a3f703252cc763fc61ccf2c24 SHA-256: a0b59f045276aa7721e0192aca8d374e15959ac8dbdded22654ae4a72308ac96
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are structured as PDF link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a spearphishing attachment, likely leading to a malicious payload or phishing page.

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://xezojetit.ru/award?keyword=de+aenigmate+pdf
    • http://indir-kazan.com/petovozarefozadatupesuaonff.pdf
    • http://uscarins.info/nomao_apk_aptoide_ioseeild.pdf
    • https://kozamenarolu.weebly.com/uploads/1/3/2/6/132682647/nevujewebipa.pdf
    • http://leqqurint.online/arithmetic_sequence_word_problem_worksheetinib7.pdf
    • https://givurubikuz.weebly.com/uploads/1/3/1/4/131482907/5973718.pdf
    • https://xuvibelatubeni.weebly.com/uploads/1/3/5/3/135306186/tufinutuji_jutonivife_womem.pdf
    • http://mixed-rootwork.com/the_game_of_life_2002_versiony7p6b.pdf
    • https://static.s123-cdn-static.com/uploads/4466165/normal_5ff06b554a145.pdf
    • http://interstart.online/pebutijebonakm1zox.pdf
    • http://p-kavkaza.ru/fugigibibutovovobiy2vg9.pdf
    • http://olivamebel.com/how_do_i_reset_my_insinkerator_hot_water_dispenserfqos4.pdf
    • http://fringigejy.site/fetujuwofesedonaxoe8jqr.pdf
    • http://springtea.space/683494601772sjyx.pdf
    • https://cdn-cms.f-static.net/uploads/4372673/normal_5fd3c2820db7c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/poresi/croatan_beach_surf_report.pdf
    • https://s3.amazonaws.com/zumezeviwakiz/bodudivagi.pdf
    • https://s3.amazonaws.com/fidefofudi/shafqat_amanat_ali_song.pdf
    • https://s3.amazonaws.com/ragejufa/ti-30xa_solar_manual.pdf
    • https://s3.amazonaws.com/povodijirig/towuvusofaxutoruki.pdf
    • https://s3.amazonaws.com/pizexopenaxu/69575641270.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_off0000f455.bin
9fa17e5689d16e3ee3ce07f685f4c38279b2bad45765b72ce490796ddc659b50
pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 5056 bytes
font_01_sfnt_off00010586.bin
ad3009b852ae9104a1c2e00c049015880839e981f8f2e3bf1dd1776928130661
pdf-font-stream PDF embedded font (sfnt) at offset 0x10586 16664 bytes