Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff26674e999f6d4…

MALICIOUS

PDF

75.6 KB Created: 2021-02-16 00:56:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 441c28c1c5614a3fe540020606b74bd8 SHA-1: 6e9946a6c8baa7a48c20ab6e515002d074a6533c SHA-256: 9ff26674e999f6d4108117027105c061cff2b87903cb28dbecea011c4e05aace
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are to benign-looking documents, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://baarspo.ru/123?utm_term=is+audacity+safe+to+download+on+mac', is presented as a search result, likely to trick users into clicking malicious links. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=is+audacity+safe+to+download+on+mac PDF link annotation
    • http://ebay-coupon.ru/green_book_scriptean7u.pdfIn PDF document text
    • http://load-bcp.com/how_to_fix_tablet_charger_portzx7gx.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/Zjadtgd/kaiser_pharmacy_hours_san_marcos.pdfIn PDF document text
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/fofokob-kalozetuvodup-venojamemokis-lepezo.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/f9mGtT0/dasukalixusuten.pdfIn PDF document text
    • http://instapriz.site/pejiziwabogefukawilabu2279w.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/ghcWjdJ/91994098314.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/gazijewevan/abstract_test_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/treating_chloroform_in_well_water.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/series_circuits_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/converting_feet_into_inches_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/accidents_reported_today_in_victoria_tx.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_off0000ec58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC58 5200 bytes
SHA-256: 20d3d86a255ed6f54d6371177305b6536dac8d7cffd3ddd4cadc3c7bc2107142
font_01_sfnt_off0000fe18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE18 10328 bytes
SHA-256: 1840a5f56e78e04f01c43e4fe04e660126baee4391be07f2971324a2833d4b86

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