Malicious PDF — malware analysis report

Static analysis result for SHA-256 553a1c0be8af6086…

MALICIOUS

PDF

90.5 KB Created: 2021-02-15 09:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9136590e56261995aae3194d4dec3062 SHA-1: 339f77d83d1ffaa1538f0db03bfb4d26b46fc92b SHA-256: 553a1c0be8af6086871e24d42e90820846f375c8e46e0c5ca878978c7dfa4b4f
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicating a link farm designed to redirect users to potentially malicious sites. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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
  • 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://seumenha.ru/wix?keyword=serenity+massage+spa+and+reflexology PDF link annotation
    • https://cdn.sqhk.co/lubigegek/a6geqgd/foriru.pdfIn PDF document text
    • http://wgathering.org/322396313635dryx.pdfIn PDF document text
    • http://photoforce.ru/military_reporting_statement_formatzia0s.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/fjjiajc/random_character_generator_with_picture.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/hbZFlqa/1504066850.pdfIn PDF document text
    • https://sorajofuwomukiz.weebly.com/uploads/1/3/1/4/131407138/06385d3cf384f.pdfIn PDF document text
    • https://cdn.sqhk.co/baxafapunubi/jikiheT/1653422684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488137/normal_601412acaf1f5.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/hieCzyY/diafoot_sb_cream_uses.pdfIn PDF document text
    • https://cdn.sqhk.co/fajoliteve/jiihhhf/chicken_drumsticks_instant_pot_cook_time.pdfIn PDF document text
    • http://bijipejip.iblogger.org/wifi_usb_adapter_for_pc_driver.pdfIn PDF document text
    • http://sdek-24.cc/totofunexageteturunoku3u339.pdfIn PDF document text
    • http://nazhivy.net/christ_our_life_grade_7_chapter_14_review_answersghyl4.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/Hiaib5p/tikelemitiratusoriwadezit.pdfIn PDF document text
    • https://mogewojelepa.weebly.com/uploads/1/3/4/6/134681452/6441862.pdfIn PDF document text
    • https://cdn.sqhk.co/bozadukopufu/cig6PCJ/93797003052.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bexumasifawej.epizy.com/90496385869.pdfIn PDF document text
    • http://roniderekatitim.rf.gd/ascii_full_form_in_computer_language.pdfIn PDF document text
    • http://fivamoxopel.epizy.com/evaluation_form_template_for_students.pdfIn PDF document text
    • http://rogidisili.rf.gd/sogepaluxolixiwasufa.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_off00012485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12485 5632 bytes
SHA-256: 6e50c04f2845af6a72d85c8e3319d3f723576afcf6660f76a34c4950bb9e9c96
font_01_sfnt_off000137a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A6 10704 bytes
SHA-256: 529f1b9c8cf56e44393111405d32ce020dbc00b225047b4e196a53eed01a4f96

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