Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22b7a5f866f2371…

MALICIOUS

PDF

70.5 KB Created: 2021-06-12 09:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 53a487f79272a6e6d13f383b2830f5f1 SHA-1: eccd2576c4339da899538000dcf0110a29111989 SHA-256: c22b7a5f866f2371f23a03231a5a544867b3f4f56942e392bfac3217012956fd
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to various disposable hosting sites, one of which is specifically linked to a 'self study class 10 science pdf download' lure. This suggests an attempt to trick users into downloading malware disguised as educational material.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/pbw?utm_term=evergreen+self+study+class+10+science+pdf+download PDF link annotation
    • https://kuxubujokug.weebly.com/uploads/1/3/0/7/130775750/8266531.pdfIn PDF document text
    • https://vidapinuluselas.weebly.com/uploads/1/3/4/8/134865598/1264910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472506/normal_60541ef795b4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_60119d75ed24e.pdfIn PDF document text
    • https://mereduje.weebly.com/uploads/1/3/4/7/134751500/7960251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453891/normal_606af5f2dd844.pdfIn PDF document text
    • https://wunurobi.weebly.com/uploads/1/3/4/8/134881210/wiwonopugokoz-noxosapawal-zomizanitax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491969/normal_606737604e428.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/abeb279d-cbdc-4353-96b4-c88e9f1d4079/nikon_coolpix_s6500_charging.pdfIn PDF document text
    • http://tekitejug.pbworks.com/w/file/fetch/144670446/54937762007.pdfIn PDF document text
    • http://papedisuk.pbworks.com/f/6714238675.pdfIn PDF document text
    • http://pijovaj.pbworks.com/f/best_performance_certificate_format_in_word.pdfIn PDF document text
    • http://gozuwef.pbworks.com/w/file/fetch/144517323/gifere.pdfIn PDF document text
    • http://zosajivapesi.pbworks.com/f/29803660502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf3cc6f-212e-4ed5-81ed-3a56ac87ce04/ejemplos_resueltos_de_balanceo_por_metodo_redox.pdfIn PDF document text
    • http://gozuwef.pbworks.com/f/lonatasepagemuxusopep.pdfIn PDF document text
    • http://gijorugisaw.pbworks.com/f/22436355639.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144778662/hand_lettering_brushes_for_procreate.pdfIn PDF document text
    • http://bomasasawavi.pbworks.com/w/file/fetch/144840837/foxconn_n15235_motherboard_lan_drivers_for_windows_xp.pdfIn PDF document text
    • http://zabodovojif.pbworks.com/f/difference_between_covalent_bond_and_metallic_bond.pdfIn PDF document text
    • http://redelaw.pbworks.com/f/how_to_get_free_fortnite_accounts_2021.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_off0000d5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B3 5728 bytes
SHA-256: 3cfbad9563f916347783258df5018b7a36788efa88aade6e99b587095fc3c685
font_01_sfnt_off0000e96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 10340 bytes
SHA-256: b37d84837ded8abe588ca1de6cfd1c588c4452d15f92c768c94f5d695b61059f

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