Malicious PDF — malware analysis report

Static analysis result for SHA-256 7328da6f5c7206dd…

MALICIOUS

PDF

72.1 KB Created: 2021-02-24 11:13:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 254caef9069e2b84d2d08c3c88915270 SHA-1: f714be64ad478b2571031d0331858bc09aa19596 SHA-256: 7328da6f5c7206dd7eec697f4583b75b9a02ff39bf48103cdda75c1eb6abdb92
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, including one to 'maypoin.ru', disguised under a lure of 'challenging math problems for 2nd graders'. The presence of multiple disposable domains and link farms suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=challenging+math+problems+for+2nd+graders PDF link annotation
    • https://cdn.sqhk.co/bamewimoxatu/afhbKhc/zonebigoxigujalojutili.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_5fe90ee42a2a0.pdfIn PDF document text
    • http://my-favshopg.online/nero_fest_guide_fgockl2o.pdfIn PDF document text
    • http://english-10.site/world_cricket_championship_2_wcc2_gamepstd0.pdfIn PDF document text
    • http://rululidevasuv.22web.org/sansa_clip_plus_firmware_update.pdfIn PDF document text
    • http://regsenatvumen.website/internet_video_er_apple6vmes.pdfIn PDF document text
    • https://cdn.sqhk.co/dujagazatad/cigLhia/assistive_touch_not_working_iphone_xr.pdfIn PDF document text
    • http://zabavnyi-slon.ru/issa_case_study_steve_rogersz0dug.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/b7jhjeK/world_basketball_challenge_unblocked_66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xinirujoki.epizy.com/fox_tonight_tv_guide.pdfIn PDF document text
    • http://fepavipa.epizy.com/alkaline_foods_chart.pdfIn PDF document text
    • http://nipimixo.epizy.com/pizatupubuvemetozajavenug.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/hush_hush_becca_fitzpatrick_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/laundry_detergent_for_bamboo_sheets.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_off0000db18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB18 5632 bytes
SHA-256: ee693a3f925fa1685da030a262cbb0b42a33e9b5563f7da395548007be370aa4
font_01_sfnt_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 10468 bytes
SHA-256: 1bf1c5613a633fd481240609c65075e82106409bedef726e17fa179926be8626

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