Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fc304c575aee11…

MALICIOUS

PDF

88.0 KB Created: 2021-04-27 02:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 42cd7b8788e569e1d1a82d9a7624ab99 SHA-1: 4258ecb72ce2bde54ea41e4d283591097b4041df SHA-256: a6fc304c575aee11c37a035890d20a43e2ecf98ce2ad76fb8aa5a73d9fe28e6c
134 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including one pointing to a suspicious domain ('midufefew.ru') with a 'turtle beach elite 800 mic not working ps4' query, suggests a phishing or credential harvesting attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm designed for malicious purposes. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely attempting to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/strik?utm_term=turtle+beach+elite+800+mic+not+working+ps4 PDF link annotation
    • http://afracheat7.xyz/60127198912770cb.pdfIn PDF document text
    • http://dokaxirugik.medianewsonline.com/befixovowuwodatoronaxowek.pdfIn PDF document text
    • http://winoraama.fun/silhouette_cameo_3_software_deutsch6v72c.pdfIn PDF document text
    • https://cdn.sqhk.co/pemanunid/YfQa0ZL/3856431557.pdfIn PDF document text
    • http://tuxesimufimiti.mypressonline.com/73256730077.pdfIn PDF document text
    • http://discount50.pro/how_much_oil_does_a_2008_scion_xb_take3i4jd.pdfIn PDF document text
    • https://bubebozozuj.weebly.com/uploads/1/3/1/8/131871643/lazivikilubu-doxejujodaxen.pdfIn PDF document text
    • https://cdn.sqhk.co/tewisifupib/hhhg23a/stickers_de_amor_y_amistad.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/san_francisco_airport_to_santa_rosa_bus_schedule.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/deontology_and_consequentialism.pdfIn PDF document text
    • https://napakako.weebly.com/uploads/1/3/0/9/130968915/visojomar-kosabedilerofiv-jeveliganoreko.pdfIn PDF document text
    • http://lasns.fun/22367759385elqwx.pdfIn PDF document text
    • http://neditaxuvim.getenjoyment.net/affairscloud_june_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/jbgi4jf/megof.pdfIn PDF document text
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/fejisujarawow.pdfIn PDF document text
    • https://wapafakomix.weebly.com/uploads/1/3/4/7/134740591/97ed1.pdfIn PDF document text
    • https://cdn.sqhk.co/memukodafum/hggYKjj/dell_latitude_5490_laptop_datasheet.pdfIn PDF document text
    • https://cdn.sqhk.co/gixekoji/ER1ia7I/flights_to_florida_from_detroit_spirit.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/flowers_for_algernon_summary.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/ad2c142b-9b66-43a0-a33c-5dc8e74fd65d/14467545751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ac8fa0-636c-4321-a895-2438af739309/what_is_the_code_for_samsung_tv_for_dish_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf9fea1e-012a-4857-91dc-a9f66ecb2cc3/korean_vocabulary_words_download.pdfIn PDF document text
    • http://bagugexasorip.myartsonline.com/felonulufilokatarebi.pdfIn PDF document text
    • http://lojubefogugiku.onlinewebshop.net/capture_one_pro_12_manual.pdfIn PDF document text
    • http://xawiwevivuzox.onlinewebshop.net/nujogevage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4c03504-5c51-4999-a1f7-4ccc4c643878/genujawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ef9fafb-1f10-4b33-a15f-48f7c7e5d71d/jipevosere.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_off0001148e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148E 6016 bytes
SHA-256: 58512a8529a4d546ed82e289581c3dd680c8a4fe3f057fc1c9f3742f25f2b914
font_01_sfnt_off000128f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F0 12252 bytes
SHA-256: 673d9cd9dfccbace3552931ba525e60dada1de06899c2f820fd8ac2b752daf7e

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