Malicious PDF — malware analysis report

Static analysis result for SHA-256 31998813be046ce6…

MALICIOUS

PDF

79.7 KB Created: 2021-03-05 18:52:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f3e311431fc70c044205f490b0cd0ab1 SHA-1: 8b1d7a2d6d2bad7dc009eb86270c664dd965479c SHA-256: 31998813be046ce674b7570f346204c41105d1867b2178f3b939dca1a4f73fd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings. One prominent URL, 'https://jumiwimov.ru/strik?utm_term=how+do+i+use+my+amazon+echo+as+a+bluetooth+speaker', is presented as a search result, suggesting a phishing or scam attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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
  • 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.
  • 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://jumiwimov.ru/strik?utm_term=how+do+i+use+my+amazon+echo+as+a+bluetooth+speaker PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380531/normal_602b9694d4a62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_5fe8cef7e0107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450042/normal_600e5a83ac3b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408583/normal_60261fd975e6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427282/normal_5fde716de44ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://berefokegiji.rf.gd/bda_diet_sheet_type_2_diabetes.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/46620667778.pdfIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_70bd806d99f84f7eaa78dfda81539aa6.pdf?index=trueIn PDF document text
    • http://pugafezozanuw.epizy.com/virimubepakamo.pdfIn PDF document text
    • http://dekuravimej.epizy.com/zomegirenova.pdfIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_cda631043f1041458beaf5f72eb87103.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/miss_my_school_days_images.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/aws_sts_assume-_role_terraform.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/graco_snugride_click_connect_35_car_seat_installation.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/vlookup_example_two_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c46d5a-02f5-4d8f-902c-19c8ca56003c/60463949207.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/92466007662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a510412-42ba-47f8-9bd5-dde23fa6024e/kenwood_tm-d700e_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/38121721968.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/isr_4000_router_datasheet.pdfIn PDF document text
    • http://musovulazapa.epizy.com/kawar.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_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 5724 bytes
SHA-256: 8e193ecce2da93aa14052cb72b9db5b86b4fb03697cc6d55f3d41474751ca585
font_01_sfnt_off00010d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5A 10632 bytes
SHA-256: 0d8ee7d06aec6560b36c507fc680c2f5986ddff7b9553e420a1096991b3dd529

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