Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c073ef6cdf2a853…

MALICIOUS

PDF

76.5 KB Created: 2021-02-14 11:48:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 0d948b7c45380029e04218adf3b91142 SHA-1: 791bdd1f2197e69bd0e347978bd800d86e0610b5 SHA-256: 3c073ef6cdf2a853d4863b7ab25692731613da234222093773b0e176bbd342b7
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with several pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=allan+kardec+livro+espiritos+pdf PDF link annotation
    • https://cdn.sqhk.co/junulevi/idgjghM/kolo_a_color_maze_puzzle_answers.pdfIn PDF document text
    • http://logowiwubapokar.iblogger.org/google_frp_bypass_7._0_apk.pdfIn PDF document text
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/1c26d22c2.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/c0lfxD1/gun_builder_elite_mod_apk.pdfIn PDF document text
    • http://jokixulu.iblogger.org/opera_browser_with_vpn_for_android_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/Rggifhh/25124144658.pdfIn PDF document text
    • http://sfr-espace.best/21804982150k1ink.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497650/normal_5ffb8c152caf4.pdfIn PDF document text
    • http://remontlegko.info/kikamegejabuviv5t1p1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420924/normal_5fe46730aad11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_5fd6754e6682c.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/ihgiSha/prop_hunt_free_online_game_no_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/carmageddon_reincarnation_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/gosomusikevazulekoji.pdfIn PDF document text
    • http://perotufusutukes.epizy.com/daxaboguwuli.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/classic_hunter_bis_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/bakunanukuz.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_off0000ed06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 5264 bytes
SHA-256: a41f50017881a8ccefc2e7e2c5a81f4c7331d75fb1487d84245aa1b184c458e5
font_01_sfnt_off0000ff08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF08 11764 bytes
SHA-256: dba76d0e8b94a88924009546632adb14f7721562949c09de08a2e7029584b181

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