Malicious PDF — malware analysis report

Static analysis result for SHA-256 8507440e0b0bfe8a…

MALICIOUS

PDF

74.2 KB Created: 2021-02-20 01:06:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6e14eb9d16cae0c241dae55fa96c1e19 SHA-1: bd11137f98645a87d52e4cc62b9115c032ed5d79 SHA-256: 8507440e0b0bfe8ae98212b7a455846fdb100849608c7252e608eb939f6e4e0c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'Obituary of common sense pdf', aligning with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jacksth.ru/123?utm_term=obituary+of+common+sense+pdf PDF link annotation
    • https://cdn.sqhk.co/lamajemomu/agjskhj/25780814045.pdfIn PDF document text
    • https://dufelawukada.weebly.com/uploads/1/3/2/6/132682042/wuseze.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/kieBgj6/tiny_bubbles_ukulele_chords.pdfIn PDF document text
    • http://morpeoplelife.ru/luke_bryan_new_video_knockin_bootslc7z1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455370/normal_5fd880890f1b2.pdfIn PDF document text
    • http://ninureluxoxanu.22web.org/huntsville_tx_police_department_accident_reports.pdfIn PDF document text
    • http://totepopewag.iblogger.org/33664461743.pdfIn PDF document text
    • https://cdn.sqhk.co/zabeluzitema/fgjghhd/ditixo.pdfIn PDF document text
    • http://bedating.online/kaabil_full_movie_720p_blurayfd9zb.pdfIn PDF document text
    • http://pasendapp.online/52455291222o0eqe.pdfIn PDF document text
    • http://avit0.cc/48526910061w3p4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zepurudevivo.rf.gd/kind_of_houses_worksheet.pdfIn PDF document text
    • http://favigagiwu.epizy.com/android_studio_c_debugging_not_working.pdfIn PDF document text
    • http://pojuzuduxotazup.epizy.com/bodoni_mt_condensed_normal_font.pdfIn PDF document text
    • http://kutijizon.epizy.com/59934071488.pdfIn PDF document text
    • http://sewegijod.rf.gd/cartoon_network_ben_10_tamil_movie.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_off0000e49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 5540 bytes
SHA-256: 50fb0470c0c2c30acb73be7a286e112e6032af37a6f130dd4cec0229e4529010
font_01_sfnt_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 10668 bytes
SHA-256: e0e15529e735fb067f7a9cbc7f925509d3693a0eec1e65566ed3306ae693e04a

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