Malicious PDF — malware analysis report

Static analysis result for SHA-256 69cda3436d40affe…

MALICIOUS

PDF

75.2 KB Created: 2021-02-16 17:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 898da4d3a564ffddd6933b47b0edf8f1 SHA-1: 499bf927b706e60c6c2407f05c4d3a85c81ad34c SHA-256: 69cda3436d40affe10a1ef7b2a34624f1f750184b4e69a0f834186df1b194a12
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru'. This, combined with ML classification and ClamAV detection, strongly indicates malicious intent. The embedded URL is likely used to lure victims into visiting a phishing site or downloading a secondary payload. While no scripts were explicitly extracted, the PDF structure and malicious link suggest an attempt to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=how+to+use+enteral+feeding+tube In PDF document text
    • https://cdn.sqhk.co/lobinazema/habjchc/download_police_vs_zombies_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenosefob/Echcjfi/download_game_zombie_evil_2_mod_apk.pdfIn PDF document text
    • http://podcard2020.site/8514155259305t1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381756/normal_5fe57d7e34191.pdfIn PDF document text
    • http://sberpodarok2020.online/cold_chamber_die_casting_processrwkc3.pdfIn PDF document text
    • https://cdn.sqhk.co/purilusevike/ffPMPYB/45251962518.pdfIn PDF document text
    • http://sait-ok.ru/volume_of_prisms_worksheet7uano.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/jfKhbbu/tepidatenoxep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481510/normal_600fc5a1a9140.pdfIn PDF document text
    • http://shortsomfj.space/bashment_time_riddim_songsop9gm.pdfIn PDF document text
    • http://creamwalls.space/13569296321cv814.pdfIn PDF document text
    • http://libertinemodels.com/17084758980uriov.pdfIn PDF document text
    • http://setlyb.online/62999110646sfwui.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/patotale/age_of_war_3_hacked_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/14239934013.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/27933230778.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/51808024927.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/performance_appraisal_process_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/inequalities_worksheet_7th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/check_if_a_linear_transformation_is_injective.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_off0000eba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA4 5268 bytes
SHA-256: df4c4dfee81cc7734c06512246ebe793ac77a4badf58d164321e832af9e4137b
font_01_sfnt_off0000fda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA9 9828 bytes
SHA-256: 67548471cc3cd12a95a4c14f395020fd3356f691a1ca2fdd64f927a5c48437be

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