Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a19daa165d4483…

MALICIOUS

PDF

84.6 KB Created: 2021-03-25 09:34:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 893412880bb39f4f53fc5b8d0ce08a18 SHA-1: bd113a3980af2dcf1d1ffd5eee3d76ec6e030fa7 SHA-256: 89a19daa165d448379ff01654ecd91c307113128deae3fa13b5f08a8edcb1207
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, and is described as a link farm. The presence of external URIs suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or to download further malicious content. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/award?keyword=data+structures+and+algorithms+in+java+tamassia+pdf PDF link annotation
    • https://cdn.sqhk.co/ludafojebi/NnhiSgh/1521129854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460677/normal_600c536f81728.pdfIn PDF document text
    • http://gbo.guru/870692563311n4zx.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvaratuji/hfOAiel/makaxesosuropovodino.pdfIn PDF document text
    • http://antonioit.space/2443627654996rer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497646/normal_5fd067c912024.pdfIn PDF document text
    • https://cdn.sqhk.co/dupeguwova/gitcjjn/zing_zang_bloody_mary_mix_nutritional_information.pdfIn PDF document text
    • https://cdn.sqhk.co/bajowekununa/bosKScq/seven_s_code_apk.pdfIn PDF document text
    • http://avit0.pro/how_to_cite_apa_formatz7oxz.pdfIn PDF document text
    • http://55571.ru/bully_anniversary_edition_game_apkpurej0les.pdfIn PDF document text
    • http://sodaapp.club/pogewutodabonuzuxuborebig1zzi3.pdfIn PDF document text
    • http://jenirafona.22web.org/33637071439.pdfIn PDF document text
    • http://chtotakoevuxom.biz/how_to_deal_with_power_imbalance_in_conflict_resolutionqhwd7.pdfIn PDF document text
    • https://cdn.sqhk.co/fisejadiruw/1MLhajh/west_game_tips_and_tricks_deutsch.pdfIn PDF document text
    • http://ranking-se.com/pyaar_tune_kya_kiya_mp3z3l48.pdfIn PDF document text
    • http://flash-sar.online/58963646297f1qz4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vedudide.rf.gd/jidejadug.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/74145669402.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/is_business_analytics_a_good_course.pdfIn PDF document text
    • http://senofigudam.epizy.com/75839866160.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 5704 bytes
SHA-256: 88c592cafd6a3f4daad5bd39b90e3a1a1efdd042ea8eb68589f81a77d4aa0448
font_01_sfnt_off000107fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FE 11756 bytes
SHA-256: 60b9582484573911a0409da0d30c6230794c7f8efe1c6b90d2d7e4afafcd832d
font_02_sfnt_off00012f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6A 16084 bytes
SHA-256: ac8bf562210f9163fcb9214d3b5b8e5576665f260beeea2276f286b91eb3ef2a

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