Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3108cc41e270ec…

MALICIOUS

PDF

74.5 KB Created: 2021-03-22 07:59:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3aee3b5d256326d9c4ddbe159ca928b4 SHA-1: ab8c062d845ec8bdaeed61fdf3f9715c4aa55f0d SHA-256: 8a3108cc41e270ece4b31e752f7a904e2100b4f0eb229de0b2c532f8a9bbc270
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, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The document body, though heavily corrupted, contains keywords that could be used as a lure, such as 'rationale zahlen rechnen aufgaben pdf'. No scripts were extracted, but the presence of external URIs and the overall heuristic profile strongly indicate a phishing or malware distribution attempt.

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://nipisod.ru/award?keyword=rationale+zahlen+rechnen+aufgaben+pdf PDF link annotation
    • http://ridunculus.com/luwopowe62zkw.pdfIn PDF document text
    • http://obmenkalnr.online/star_wars_the_old_republic_bad_controlsfxk1n.pdfIn PDF document text
    • http://kepidurenomabo.22web.org/farewell_to_manzanar_movie_watch.pdfIn PDF document text
    • http://pabesubibo.66ghz.com/suzakoxaramulifukuteg.pdfIn PDF document text
    • http://lopavatizurafe.iblogger.org/hitwicket_cricket_strategy_game_mod_apk.pdfIn PDF document text
    • http://paksorond.xyz/bimoruxefazigebuzibetw9y6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479433/normal_6030eb2197b1f.pdfIn PDF document text
    • http://bosajefidil.iblogger.org/allegory_of_the_cave_by_plato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486200/normal_60379768a3b5a.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/af2721a2-6ca2-4202-b97d-b86ec1ea0b16/karebulawujakufekamorex.pdfIn PDF document text
    • http://movafomuwexowix.epizy.com/fitaxulivabapezinaterila.pdfIn PDF document text
    • http://verejixufitoge.rf.gd/transistor_bd139_smd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7834132a-8e94-4aa9-a31e-cde44469c0fa/horus_rising_hardcover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f7255a9-4005-4d7f-a12e-c065673c7c41/what_is_power_mediation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/804c0881-8f0c-4b9c-8cfa-ef449e01c130/how_to_reset_foscam_password.pdfIn PDF document text
    • http://kagufunoziwezu.epizy.com/bram_stoker_s_dracula_movie.pdfIn PDF document text
    • http://balukop.rf.gd/50986407936.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_off0000e0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FA 5436 bytes
SHA-256: f170ea909750291063c61b7dd1f874766f5d1640b8754cbf6ce1488b3c7f0812
font_01_sfnt_off0000f37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 12460 bytes
SHA-256: fe59eafcc9e6ec843c0ef89b197377ad695280a1685e673e94170f97071b3f85

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