Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fe51dc6b0beef3…

MALICIOUS

PDF

75.1 KB Created: 2021-03-14 16:53:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 26f88d9a5cabe25848884b6e776d24be SHA-1: aef31a0b202375b413ef323c1d529aa8a3ddc2d4 SHA-256: 83fe51dc6b0beef305643f880e61788ea316aca80e77f0937b81ab9efa61d7a1
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The file contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'ML_NYX_PDF_MALICIOUS' heuristic indicate a high likelihood of phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://yafferge.ru/123?utm_term=angular+6+reset+form+except+one+field In PDF document text
    • https://cdn-cms.f-static.net/uploads/4423195/normal_604d23c11946c.pdfIn PDF document text
    • https://sipinawuzukefo.weebly.com/uploads/1/3/1/4/131410227/kikuzifabikejik.pdfIn PDF document text
    • http://stav-games.ru/brother_sewing_machine_ls-2125i_manual5dmq4.pdfIn PDF document text
    • https://kofodurulivikaf.weebly.com/uploads/1/3/3/9/133997487/maxomawitavatosodix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496153/normal_5ff1c180e25a2.pdfIn PDF document text
    • https://torobekaxiwe.weebly.com/uploads/1/3/1/3/131380482/bupuf_sozuveranevum_xumimoked_xovulod.pdfIn PDF document text
    • https://gidiwukos.weebly.com/uploads/1/3/1/3/131381706/fetimirigezukul-sabopujum-maruwuxagonu-wagarexexubake.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/fjj0d3k/2048_cool_math_games.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/giggfeR/playstation_video_app_not_working.pdfIn PDF document text
    • http://kpupnov.pro/mobuwezagobezewetule5dr2k.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/jipizuneposoxikarufoven.pdfIn PDF document text
    • http://dapovevi.mywebcommunity.org/what_does_dependent_mean_on_taxes.pdfIn PDF document text
    • http://mon-compte-cmb.best/our_environment_includes_which_of_the_followingrkt22.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/moon_river_lyrics_frank_sinatra.pdfIn PDF document text
    • http://perevod24-card2card.site/sms_messages_app_ipadoocyn.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/nekez.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/biology_book_by_miller_and_levine.pdfIn PDF document text
    • http://edevletorg.com/2446137627sk2r4.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/bdad27d6-8eee-423e-98a1-0c0af11be12a/8348736722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41972c36-6d92-4016-af52-241351f4514e/22348857059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a04f9747-93d6-4054-b021-ab0d847ea369/50836396441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c5ad8b-3bf6-4faf-bfb5-3b1ef8a87e80/what_order_do_the_mortal_instruments_books_go_in.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_off0000e3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 5688 bytes
SHA-256: 5c3b96664e53f346f9f165346d3fd84b415979b4b5548b5ce1d35142282b5f38
font_01_sfnt_off0000f707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 11676 bytes
SHA-256: c5f15d1b8ead53c10ac4f0c764492299fd572589a76e57859f776c4888836378