Malicious PDF — malware analysis report

Static analysis result for SHA-256 38fa24a25663da6c…

MALICIOUS

PDF

72.8 KB Created: 2020-11-11 09:27:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7c452ef247ddcc2282e7545078e0867f SHA-1: db71181fdeddc7443e4abcf01b6d53c29c9c25cb SHA-256: 38fa24a25663da6c724839395c90e6d0113185bdbb09eb41bcd96e7c2989b275
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://trafffi.ru/123?keyword=allen+carr+quit+smoking+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369794/normal_5f925091d2e85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_5f8edc46af094.pdfIn PDF document text
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/5500249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427295/normal_5f9aecf8161ca.pdfIn PDF document text
    • https://budezovurok.weebly.com/uploads/1/3/4/5/134507550/2708610.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/ginutu/xeriwur.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/3274438356.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/the_periodic_table_of_elements.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/suvobufaxifisudatarogogun.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/words_start_with_e_end_with_q.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/adobe_reader_download_softonic.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/order_of_events_for_wedding_reception.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/98328794880.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/94084374824.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/6248225951.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_off0000e07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07F 5656 bytes
SHA-256: a376d04c6c798535387a0476745612bb7b7a3841f05c4c5bd9f9eb804fc21469
font_01_sfnt_off0000f3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 10256 bytes
SHA-256: 113344d61fe8659e293f79563d2cbec0ba3b64c89fab8b062b0ecc9fc3fe350c

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