Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7b6abe4a797fce…

MALICIOUS

PDF

67.9 KB Created: 2021-03-01 01:33:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 51f912f26a385d28ff12f548c23d41d4 SHA-1: 748d581a49f5da69a8c2840f23f07778d2198e46 SHA-256: bd7b6abe4a797fcec0c65088b4b9f447bca86bea8bebc4673c3ea3f9d6c212d2
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 domains, suggesting a link farm or phishing operation. The presence of external URIs and the 'link farm' heuristic indicate the document's primary purpose is to redirect users to potentially harmful websites.

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://druttle.ru/aws?utm_term=how+to+remove+battery+from+alcatel+one+touch+tablet PDF link annotation
    • http://kazexajisodibu.medianewsonline.com/youtube_christmas_carols_silent_night_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415946/normal_6015c9db7108c.pdfIn PDF document text
    • http://balifruit.com/zedge_for_iphone_wallpapersdhwr3.pdfIn PDF document text
    • http://naturaitalia.space/android_google_maps_simple_exampleu5dio.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/gemenenavikunos.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/college_board_sat_chemistry_practice_test.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/tumimafox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425723/normal_5fe6457f38ed6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470211/normal_60107215f1fcd.pdfIn PDF document text
    • http://lovepositions.info/which_thermostat_is_compatible_with_nestb0k4o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488804/normal_5fed42f9a3e63.pdfIn PDF document text
    • http://online-bestshop.xyz/taketamenotopinuvamiwuwukvm5sd.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/how_to_do_a_character_count_in_word.pdfIn PDF document text
    • http://remastacer.com/997060469289lkx5.pdfIn PDF document text
    • http://midarujiwuvi.mygamesonline.org/vegiwituwaromemiboki.pdfIn PDF document text
    • http://speak4pro.com/stm32f103c8t6_arduino_bootloadervrrfa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wugujub.onlinewebshop.net/honda_rebel_for_sale_ohio.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/kajopudakox.pdfIn PDF document text
    • http://nibubatovavav.atwebpages.com/47210197853.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_off0000cc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9C 5296 bytes
SHA-256: e118188b8718ce850ced81215526ed359fd02c8b1c130122e89c5f5cb48ee045
font_01_sfnt_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 10368 bytes
SHA-256: 836fc2ad6adce89b53d7b94bcde5938a1f40305e34404ef29fa202dbf6772768

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