Malicious PDF — malware analysis report

Static analysis result for SHA-256 777a3b93c3be614e…

MALICIOUS

PDF

73.5 KB Created: 2021-02-28 03:45:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f5e0e92a7cd09b86ae2fec31c1bd4fda SHA-1: 7dafec682a16a3b3ad4117b113c559497a0730f0 SHA-256: 777a3b93c3be614e94b1e2694978157a97c487ed4aaaed5fbf50765a14ddb039
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with several pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'ML_NYX_PDF_MALICIOUS' strongly indicate malicious intent. The file likely serves as a lure to direct users to phishing or malware download sites.

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
  • 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/strik?utm_term=how+to+use+my+doro+6520+phone In PDF document text
    • http://limecash.xyz/where_can_you_watch_the_secret_moviev8s7f.pdfIn PDF document text
    • http://normal-id.com/93188480716d9mlt.pdfIn PDF document text
    • http://instapriz.site/rexapufq4p.pdfIn PDF document text
    • http://ogranicbio.fun/puzidudetud6wj6s.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/the_mindful_twenty_somethingdul7n.pdfIn PDF document text
    • http://glossywp.online/eden_movie_2014_parents_guideb8ux5.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/niporofez/anatomy_bones.pdfIn PDF document text
    • http://xamilelamijokuk.rf.gd/61261107083.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/firefox_for_pc_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/area_trapezio_isoscele_formule_inverse.pdfIn PDF document text
    • http://melumudinev.epizy.com/61449388589.pdfIn PDF document text
    • http://lidekajemunow.epizy.com/esp8266_12e_nodemcu_kit_datasheet.pdfIn PDF document text
    • http://fuwotatikiluwa.epizy.com/airport_extreme_base_station_user_manual.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_off0000e191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE191 5664 bytes
SHA-256: fe83abdf26843b623e8fab120777281e9ad175762a6693c2640488274a6c8bd3
font_01_sfnt_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 10644 bytes
SHA-256: b0b13d7b1b2d7269d6e4203c324cb5522d5a9b6bd50f0786e6b3834e2d217ac7

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