Malicious PDF — malware analysis report

Static analysis result for SHA-256 8026168d03d51652…

MALICIOUS

PDF

75.9 KB Created: 2021-03-31 10:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 56ae0911ed90e2aa6a6b69c28160d4ec SHA-1: 5c9641d48a9c29bcd32e814249a778673fcac1b9 SHA-256: 8026168d03d5165227f6a22a84e6963bf5a2671de9106ff0a3b94afd02820d57
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the document as a link farm on disposable hosting, and the presence of external URIs further supports this. Although no scripts were extracted, the overall structure and URL distribution point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/award?keyword=purchase+contract+form+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415935/normal_6063c9940b674.pdfIn PDF document text
    • http://filuniguwol.22web.org/ocean_8_full_movie_in_tamilrockers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_5fd2484921e83.pdfIn PDF document text
    • http://recepty-dd.info/20681352432xxtmn.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/63032412568pb85e.pdfIn PDF document text
    • https://cdn.sqhk.co/lemisobe/jfgfGjc/coffee_weight_gain_or_loss.pdfIn PDF document text
    • https://cdn.sqhk.co/salifera/hsjhjdr/49050768364.pdfIn PDF document text
    • https://cdn.sqhk.co/fanabezom/LgdhgMh/pikaj.pdfIn PDF document text
    • http://novuzigekisev.iblogger.org/core_clinical_cases_questions_and_answers_in_medical_ethics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384817/normal_5fdf854aa1dc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461229/normal_5fcbe2054e787.pdfIn PDF document text
    • http://pihodze.com/what_is_the_best_stand_mixer_for_bakingohfkz.pdfIn PDF document text
    • https://cdn.sqhk.co/mavixuwaloz/eBiajgS/bike_racing_game_download_for_windows_7_ultimate.pdfIn PDF document text
    • https://cdn.sqhk.co/vidikusupegu/Q2Uifko/seattle_police_officer_killed_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386839/normal_5fc8c4a19f1cc.pdfIn PDF document text
    • https://cdn.sqhk.co/jasorevujoxu/A9gi2gi/67251923188.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/dRYgeje/dominoes_game_sold_near_me.pdfIn PDF document text
    • http://crubr.space/cerumen_impaction_guidelinesazgaa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kusofiwu.epizy.com/fesefosovejadusajig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/214fb8cc-66e3-4475-82dc-1d5339f3930c/31367465093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8662298-c780-4bf9-b173-5c973b9e68c5/36108024598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0404f8a7-8f36-4225-a55c-eb5e2973569f/baromefixunezamimigotep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3011128f-37db-4345-981e-a70ab2d1419f/canon_200d_mark_2_price_in_india_2019.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_off0000eb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB09 5364 bytes
SHA-256: cc4873dbd4af5b59d5b2f78bcd5288ef584ac5194b457d894a9a57b62fee47d7
font_01_sfnt_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 10932 bytes
SHA-256: b57ec90e04f6effd61a216bbb43e620e73cded7cc1e97a6b0516ba669b1551b0

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