Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a223353427c524a…

MALICIOUS

PDF

85.1 KB Created: 2021-01-23 00:59:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d3dde55cae8c659c3e2689b36329666e SHA-1: 9c48785cd0b84236aa1508e27fb10a05bd2f8dfe SHA-256: 8a223353427c524a36f6a8c59efea76a894a20342d837f1803486cb52017d5b0
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, appears to be a lure related to technical manuals, which is a common tactic for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/123?utm_term=honeywell+th6320r1004+installation+manual PDF link annotation
    • https://cdn.sqhk.co/seworani/gidjfgh/post-_it_dry_erase_adhesive_surface_review.pdfIn PDF document text
    • https://cdn.sqhk.co/rebawigabog/YsQPghp/fashion_star_model_salon_game_download.pdfIn PDF document text
    • https://site-1244472.mozfiles.com/files/1244472/before_sunrise_imdb_parents_guide.pdfIn PDF document text
    • https://site-1172317.mozfiles.com/files/1172317/30567985963.pdfIn PDF document text
    • https://cdn.sqhk.co/kokademesuz/ji9digd/daxununowa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448720/normal_5ffd38fe5ca27.pdfIn PDF document text
    • http://xunajoza.22web.org/71763250601.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/hbhdVic/gubunofariwugojajazerogi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381291/normal_5fd2a0f605503.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490523/normal_5fe26ccbef176.pdfIn PDF document text
    • https://cdn.sqhk.co/xeliwiwogivo/rMiijig/bella_vista_golf_course.pdfIn PDF document text
    • https://site-1260570.mozfiles.com/files/1260570/can_t_install_burp_certificate_android.pdfIn PDF document text
    • https://cdn.sqhk.co/mejofiwog/ihhh9hh/mercado_pago_como_usarlo.pdfIn PDF document text
    • https://site-1194623.mozfiles.com/files/1194623/62594688395.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzezufe/chbtujb/last_shelter_survival_mod_apk_unlimited_diamonds_2020.pdfIn PDF document text
    • http://fafasun.iblogger.org/vaposowojome.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/gfrXiga/fake_call_for_bendy_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ximagutetala.epizy.com/banuzifalaxotegaz.pdfIn PDF document text
    • http://faxajipemafeb.epizy.com/24675514675.pdfIn PDF document text
    • http://fupuvafibip.rf.gd/zujidumajox.pdfIn PDF document text
    • http://kalotiwinilobiw.epizy.com/chava_book_free.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_off0001096f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096F 5812 bytes
SHA-256: a883374378013eaca2a7d07f9195233e962e967496214c268fb2008de3a79a5b
font_01_sfnt_off00011d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D23 12000 bytes
SHA-256: 3cd54fd943dc20b408675a3e59477cc338e584bb343995001641c1bc17c08c76

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