Malicious PDF — malware analysis report

Static analysis result for SHA-256 579e921db0bcc9b8…

MALICIOUS

PDF

73.8 KB Created: 2021-02-19 06:18:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 28e5c85e9df7365f649594f4220927bd SHA-1: 81263e1ac4aecb0fc7ea3e97afc6bb19e912c84e SHA-256: 579e921db0bcc9b856609ebea67cac9a5ded70d6630f38c28c9d2afb96c24a89
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL, 'https://baarspo.ru/strik?utm_term=autocad+3d+drawing+pdf+download', appearing to be a lure for a software download. The presence of external URIs and the ML detection strongly suggest a phishing or malware distribution attempt.

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://baarspo.ru/strik?utm_term=autocad+3d+drawing+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451561/normal_5fd1b6e0008e6.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/iVXTtib/auctionzip_mobile_pa.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/iayjhhd/41645842951.pdfIn PDF document text
    • https://bugomalaked.weebly.com/uploads/1/3/5/3/135324661/b649d873624a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452594/normal_6028c1200f0ed.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/jghW8jj/1804730559.pdfIn PDF document text
    • http://kipivejezijab.iblogger.org/happy_birthday_song_naa_songs_telugu.pdfIn PDF document text
    • https://xoxomedeze.weebly.com/uploads/1/3/5/3/135308121/7a934451da611.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502819/normal_6001bd174b513.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sonisan.epizy.com/arx_fatalis_character_creation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/sony_dsc-s85_software_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/akasam_ammayaithe_video_song_free.pdfIn PDF document text
    • http://xuxusemo.epizy.com/4063754433.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/android_notification_developer_example.pdfIn PDF document text
    • http://vigukesege.epizy.com/sagobifakaguwojemisa.pdfIn PDF document text
    • http://fudedeki.rf.gd/dodiriwukeromawajax.pdfIn PDF document text
    • http://jijazofar.rf.gd/wurumipig.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD508 5156 bytes
SHA-256: 73b1e1f08c2110de4b96f90f2fcc366e56c40e52fb43a93c60efaeb304539665
font_01_sfnt_off0000e6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A9 10964 bytes
SHA-256: d16db7cb0caeb96be0eafb5f22e88fddbd5124b968782dab6d851cd6bb4c4e6a
font_02_sfnt_off00010bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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