Malicious PDF — malware analysis report

Static analysis result for SHA-256 c424329d20c1e519…

MALICIOUS

PDF

71.0 KB Created: 2021-03-19 10:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6323fe0a77000d838984b93d269db036 SHA-1: 206637a60545135c663564bb913e8a7d79f435c4 SHA-256: c424329d20c1e51913a7e01edc2b2b3504b82aa8fa3c4e1bb853607a3d5fef05
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links. One prominent link, 'https://nipisod.ru/wix?keyword=asb+2020+loan', indicates a potential phishing lure related to loans. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', reinforcing the phishing and malicious nature. Although no scripts were explicitly extracted, the presence of external links and the ClamAV signature suggest a malicious intent, likely to redirect users to a phishing site or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=asb+2020+loan
    • https://cdn.sqhk.co/pibepufas/Xgh5ugc/keyboard_sound_effects_dj.pdf
    • http://limaxinsto.xyz/sofujikavixi0ldvk.pdf
    • http://becloud.website/wishes_fulfilled_meditationqeref.pdf
    • https://cdn.sqhk.co/bilanogakiw/jcviehj/traffic_racer_android_apk_indir.pdf
    • http://idealslim-italiaofficial.site/71144147253p7gfu.pdf
    • https://cdn.sqhk.co/lupobikud/ih2ibKq/neuroshima_hex_app_store.pdf
    • https://cdn.sqhk.co/kixarozikej/gCQlPhf/maxi_pads_with_wings.pdf
    • http://epipog.com/how_do_you_write_a_copyright_page_for_an_ebookkrjee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gowupuzokowuxes/2498897701.pdf
    • https://s3.amazonaws.com/rodiligarexo/8932447801.pdf
    • https://s3.amazonaws.com/dorulusof/14394811839.pdf
    • https://s3.amazonaws.com/ninazarila/17258164707.pdf
    • https://s3.amazonaws.com/resabomibogodaw/19777782765.pdf
    • https://s3.amazonaws.com/dojivewobasuval/what_are_the_different_theories_and_models_of_organizational_behavior.pdf
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_844a5211bb5041f0aa2c1c80e1072a4b.pdf?index=true
    • https://s3.amazonaws.com/girilifawuxi/8689282784.pdf
    • https://s3.amazonaws.com/tiniruru/11532362617.pdf
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_fb00602626fa486fa8d7268e69d0dfff.pdf?index=true
    • https://s3.amazonaws.com/kafises/risk_assessment_template.pdf
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_1ed0e36581b243ad8c19be1f2d4f21c6.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_off0000d9ce.bin
ab86e6092cdab2e7354bfe2708f89ce0eabb3ade643cae469dc8f215ca8ed4d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 4988 bytes
font_01_sfnt_off0000ead6.bin
da60708e3535a0c5f63ddaa112fc8d502083671e93b819238db4124ebb2b69b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD6 10636 bytes

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