Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eca664229dbe122…

MALICIOUS

PDF

75.4 KB Created: 2021-02-26 18:33:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c36e314a25528e2ea8853d1f1a2a63ec SHA-1: 8851cc7fb7b5b54e1eb478e38638dba8c4c767a8 SHA-256: 8eca664229dbe122b28b726a04c5c8fd993df12d7b01f6b96af18abc8a94f843
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links to potentially disposable domains suggests a link farm or spam campaign.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=us+army+special+forces+dive+school In PDF document text
    • http://yandex-dostav.ru/polaris_scrambler_500_service_manual_free_download968ed.pdfIn PDF document text
    • http://electorat.org/irobot_roomba_980_replacement_partst8yv6.pdfIn PDF document text
    • http://vumexovuvelafe.medianewsonline.com/are_chocolate_dapple_dachshunds_rare.pdfIn PDF document text
    • http://devlp.club/wintv_v10_activation_codeujern.pdfIn PDF document text
    • http://vibolofisef.mywebcommunity.org/ingersoll_rand_air_compressor_2545_parts_manual.pdfIn PDF document text
    • https://bewogataxatux.weebly.com/uploads/1/3/2/6/132695278/lojefitiv-keroguzifil-rinisanuwivebo-sibevejes.pdfIn PDF document text
    • https://sekatuxu.weebly.com/uploads/1/3/4/8/134894727/jedobe_mosolinizapu_mowixip.pdfIn PDF document text
    • http://vzale.ru/55271013903khm7.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/how_to_draw_out_a_blackhead_in_your_ear.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/sefipa/53480710952.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/besharam_movie_full_free.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_off0000ead9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 5548 bytes
SHA-256: 7ad11dc6c44630fdf23e9b5b9856be15aa759288931034b3dceef6d0bf0facb7
font_01_sfnt_off0000fd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 10508 bytes
SHA-256: bafb46388ea3b939a9d0ac9d158973f019193a98e8f213aa495a8814817e4aae

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