Malicious PDF — malware analysis report

Static analysis result for SHA-256 460a3a558be38129…

MALICIOUS

PDF

73.3 KB Created: 2021-03-19 10:54:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39d3ca4e9e06d86a6ed8eedafd241e95 SHA-1: 56220e7225a56eb7e09b8f9055247b2c5a3e28e0 SHA-256: 460a3a558be381294331bcaa04996aedef1b59f5de8bb272ea4af126da2ebfdc
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO spam tactic to distribute malicious content. The document body, though heavily corrupted, contains a keyword related to free PDF downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/award?keyword=bachon+k+islami+naam+pdf+free+download
    • https://bulasenojagaroj.weebly.com/uploads/1/3/4/3/134357248/xipizib_kawevafolate.pdf
    • https://farunigi.weebly.com/uploads/1/3/4/7/134716297/8085924.pdf
    • http://rajuxotuxux.22web.org/sage_pastel_accounting_user_manual.pdf
    • https://rawekawus.weebly.com/uploads/1/3/4/4/134467784/6188969.pdf
    • https://pepakulal.weebly.com/uploads/1/3/4/8/134885681/8331657.pdf
    • https://xapitutas.weebly.com/uploads/1/3/0/8/130813648/nutuwexezikoti.pdf
    • https://rofosuvobatijam.weebly.com/uploads/1/3/4/6/134661532/temudevatev-wawamogewova-wutore.pdf
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/fipubejubuxemivijet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bopexetosezulav.rf.gd/tabla_de_conversion_de_medidas_pulgadas_a_centimetros.pdf
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_17c84b1a2c6c413ca382323d34be17e3.pdf?index=true
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_77da73ec3cc8455db7a6a7dea2b0265e.pdf?index=true
    • http://labazorev.rf.gd/76858041061.pdf
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_da186d87223a447295bfa8937db07817.pdf?index=true
    • http://mugakot.rf.gd/wobirudojaverawetufibinan.pdf
    • http://lozufoxozaniso.rf.gd/how_to_set_up_amazon_echo_show_2nd_generation.pdf
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_3c9e92b7d45e42cf83280e70b0049fda.pdf?index=true
    • http://tulazupuvive.epizy.com/apostrophe_exercises_with_answers.pdf
    • http://bubaregelore.rf.gd/mixaposiji.pdf
    • https://bed2724e-b6a4-42c6-a365-5b2dc6a82e2f.filesusr.com/ugd/9f087b_aaaff58daa6b498a98ba55467382bbc1.pdf?index=true
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_8b4611c41f3543758fce2a92d31757ba.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df01.bin
77b579b38190b77b1d41709b83c52177050f9f06376dd7680c4904d840e6b9b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 5600 bytes
font_01_sfnt_off0000f1ef.bin
d2eb25dd60b49553d4dc4cb70bcb70efd449ab5c6467b77403531b476ccbb860		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 11012 bytes

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