Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4e8edd22fafa59…

MALICIOUS

PDF

68.9 KB Created: 2021-01-19 12:43:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8ece3ee4add842bfde23f17cc599df23 SHA-1: 72d327e39df3d0a5c9d4c0d314f6f63ea87ef25d SHA-256: 5d4e8edd22fafa59cddb3fc59f95c2efcdad384d69263120f8f0d8184568e4c0
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. It contains numerous embedded URLs, with one specifically appearing as a search result for 'chase mobile app apk download', suggesting a phishing or malware distribution lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious intent by indicating the use of disposable hosting for link farms.

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://bologen.ru/wb?keyword=chase%20mobile%20app%20apk%20download PDF link annotation
    • https://site-1177265.mozfiles.com/files/1177265/84804004984.pdfIn PDF document text
    • https://site-1167978.mozfiles.com/files/1167978/70532711676.pdfIn PDF document text
    • https://site-1174352.mozfiles.com/files/1174352/osmo_hot_wheels_mindracers_reviews.pdfIn PDF document text
    • https://site-1199436.mozfiles.com/files/1199436/vofajojufubapipivotapo.pdfIn PDF document text
    • https://site-1243723.mozfiles.com/files/1243723/is_ant_er_safe.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/A4jfidD/pakije.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/a0830dec1.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/9c521.pdfIn PDF document text
    • https://lemorixumo.weebly.com/uploads/1/3/4/7/134748879/73217904436.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/dgiig0f/fluid_wallpaper_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/buzivafulet/hhhjxja/xipememeno.pdfIn PDF document text
    • https://site-1178965.mozfiles.com/files/1178965/87371270339.pdfIn PDF document text
    • https://site-1179856.mozfiles.com/files/1179856/ps4_remote_play_mod_apk.pdfIn PDF document text
    • https://difiraboveju.weebly.com/uploads/1/3/4/5/134508976/niwedeto-lotedojap.pdfIn PDF document text
    • https://site-1167961.mozfiles.com/files/1167961/starz_customer_service_telephone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/UggdjaO/sam_and_cat_brain_crush_watch_online.pdfIn PDF document text
    • https://site-1174504.mozfiles.com/files/1174504/beck_hyperspace_review_allmusic.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB4 5304 bytes
SHA-256: b24edb9c6f28e5d992ea00a1cce72120fbb36d177472e357582daa2e8e71f982
font_01_sfnt_off0000df9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 11488 bytes
SHA-256: 8002b5229b9669713f64dfebe4d0fe6066fc5131335dfaf67a8c2577136b24f3

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