Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1c112df3ba20d6…

MALICIOUS

PDF

72.8 KB Created: 2021-02-25 13:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 20f56368f272c22e7c144a81496dbbcc SHA-1: 7d33227345e93efdd962c78b410f34780301bd0e SHA-256: ff1c112df3ba20d69a571bd0f7ef3c7ddafae45a8bfcc6799f1592d029f3a26c
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on potentially untrusted hosting.

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
  • 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://maypoin.ru/strik?utm_term=swann+security+cameras+email+setup PDF link annotation
    • https://cdn.sqhk.co/mujawiru/UhbiiuR/32266253430.pdfIn PDF document text
    • http://studytogether.fun/chesapeake_shores_episode_guide_wiki1y4my.pdfIn PDF document text
    • http://vseti.life/ragifagezolobobeggk74g.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/gijjbTR/2021_defender_110_review.pdfIn PDF document text
    • https://cdn.sqhk.co/xozawimepod/gghbzek/the_greatest_songs_of_the_60s.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/bAc22Ue/mobile_facebook_login_html.pdfIn PDF document text
    • http://bestsaleshopin.xyz/wozimerisixusixig1kbw.pdfIn PDF document text
    • http://nekevofitoruzat.22web.org/nogegumu.pdfIn PDF document text
    • http://akvatehnika74.ru/bewinizewe4rmzh.pdfIn PDF document text
    • http://filitopalanima.22web.org/1173043966.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/tihSAij/51424988921.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/pukaridimupo/business_plan_template_pages_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/alexander_movie_tamil_dubbed.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/free_adverbs_worksheet_for_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/que_es_balance_general.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/workplace_investigation_report_example.pdfIn PDF document text
    • http://bovareniwesoz.epizy.com/site_appraisal_report_sample.pdfIn PDF document text
    • http://turimovikukori.epizy.com/boom_beach_apkpure.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_off0000e029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE029 5376 bytes
SHA-256: 47d53192feab62c79059d60e34fa3e1e2d200baeee8252022becbc1702a2ab5b
font_01_sfnt_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 10436 bytes
SHA-256: 09ab9cb49b4e02f12d688c3080701be8d59f31aacabb0599cef87e788cd7b009

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