Malicious PDF — malware analysis report

Static analysis result for SHA-256 43853b14b4a05195…

MALICIOUS

PDF

73.5 KB Created: 2021-05-09 17:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f49564ab01fb2f1baf9198b4ec2eb145 SHA-1: 5aa05b608aa21f9990a4929ecde3d92a0cdd8b9a SHA-256: 43853b14b4a05195ccb1eced6c1e6606f650c83a07970cb36cd842a92621c62b
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains multiple embedded URLs, with the primary one being https://resalured.ru/strik. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, and includes a URL parameter that might be part of a phishing lure. The presence of external URIs and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://resalured.ru/strik?utm_term=am+i+a+single+member+llc
    • http://otomail.business/nordictrack_t5.3_specshbb8v.pdf
    • https://cdn-cms.f-static.net/uploads/4445320/normal_60482a140ec4e.pdf
    • http://thehensleys.org/conceptos_fundamentales_de_quimica_organicam42j3.pdf
    • http://tiwomizodelujew.22web.org/sisuruzoxuna.pdf
    • https://samivixawudajan.weebly.com/uploads/1/3/4/6/134634686/9451390.pdf
    • https://cdn-cms.f-static.net/uploads/4496580/normal_604a4a363f392.pdf
    • https://cdn-cms.f-static.net/uploads/4382406/normal_604395c0d7969.pdf
    • http://hrushch.space/understanding_your_college_experience_2nd_edition5rmlz.pdf
    • https://cdn-cms.f-static.net/uploads/4465687/normal_5fd3a9d123011.pdf
    • https://nawobelif.weebly.com/uploads/1/3/5/3/135307193/zixugu-virorir-xevonimimebe-kozezelozeli.pdf
    • http://1ux.site/new_bhojpuri_video_film_ingsfz14.pdf
    • http://fenellalucynelle.info/wordpress_blog_themes_free_download_professionalby8ie.pdf
    • https://kolokizegilo.weebly.com/uploads/1/3/4/3/134370221/xovutiwaj-rulos-kewopezif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sofugudoz.rf.gd/ralidaxofurepipovonapa.pdf
    • http://fokavugepiromi.epizy.com/geometric_mean_theorem_worksheet.pdf
    • http://witigunakejawi.rf.gd/door_frame_details.pdf
    • http://kagufunoziwezu.epizy.com/36250331538.pdf
    • https://s3.amazonaws.com/lopeteb/24_hour_clock_format_php.pdf
    • https://s3.amazonaws.com/salade/42021239548.pdf
    • http://vitufofotozam.epizy.com/38078098067.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_off0000e18e.bin
c0faab9a4dd9784ee4d7da89480e8e82fe85bc1681554dde542ee5a9fb7fa431
pdf-font-stream PDF embedded font (sfnt) at offset 0xE18E 5248 bytes
font_01_sfnt_off0000f352.bin
8404948bb1735274140038bd22b9cc7cc7d67700f8dbb2f306b9a3f5bafd526b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 11344 bytes