Malicious PDF — malware analysis report

Static analysis result for SHA-256 a142820995d7d2d5…

MALICIOUS

PDF

85.2 KB Created: 2021-02-22 22:20:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 992c94c8d18e335df80e386f578595ac SHA-1: 6fdf289093cd0d111a2b8de3b73579bad3662aa4 SHA-256: a142820995d7d2d5b427982ef6600f3360224f112e81d23f79ed1de23fcb0f38
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The embedded links, such as 'https://crophysi.ru/123?utm_term=can+you+use+bath+oil+directly+on+skin', are designed to redirect users to potentially harmful content. The ML classifier also strongly indicated maliciousness, supporting the phishing and redirection attack pattern.

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/123?utm_term=can+you+use+bath+oil+directly+on+skin In PDF document text
    • http://istlan.space/8660128872163p1s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390381/normal_5fc8e962d7eb3.pdfIn PDF document text
    • http://sazefakopek.iblogger.org/sociology_books_in_marathi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381532/normal_602c5aeb4a0ad.pdfIn PDF document text
    • http://afracheat3.xyz/100_basic_c_programszwokk.pdfIn PDF document text
    • http://podarokinsta.online/mission_impossible_theme_piano_sheet_music_freeranrn.pdfIn PDF document text
    • http://lorenbayi.com/workplace_incident_report_form_templatee8orc.pdfIn PDF document text
    • http://rocketdocs.us/biografia_de_alessandro_voltaknuyv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419623/normal_602c0f716c1f0.pdfIn PDF document text
    • http://gaxakemokesibit.22web.org/dazikoriberu.pdfIn PDF document text
    • http://goxezidoge.22web.org/jawazifusibakozitufada.pdfIn PDF document text
    • http://znasila.ru/74527062682efsbu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393515/normal_60012b828241d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391009/normal_5ff3cd3ae6a8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392857/normal_5fdd681583c51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nitufuluxa.epizy.com/simple_past_exercises_all_things_grammar.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/cadmium_sulfide_solar_cells.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/canada_election_platform_summary_reddit.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_off0001101c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 5236 bytes
SHA-256: c10a950957fa125ede713264bc05e613c7294aa185eec80520760d85b78d77b6
font_01_sfnt_off000121e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E2 11052 bytes
SHA-256: 786ef196f581e95d57717cfdc0a295ac4e0c1de0a47d25cee293c625227b88ae

Open this report in the interactive analyzer, or submit your own file for analysis.