Malicious PDF — malware analysis report

Static analysis result for SHA-256 70aee4d1f0682e8a…

MALICIOUS

PDF

87.5 KB Created: 2021-02-27 19:18:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 14f79355c776aabd98025d9e29babc4f SHA-1: 94956200fbb67be8a49d517066e0ed85a35419cd SHA-256: 70aee4d1f0682e8a720e355c028aa3054cec7994f8da5836d899f8b7a2c7dc2d
186 Risk Score

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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=vex+crazy+games+unblocked PDF link annotation
    • https://sufudavinor.weebly.com/uploads/1/3/1/3/131381021/gexidiwodojogot.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/tibelibuwekibo.pdfIn PDF document text
    • https://libizegenumejav.weebly.com/uploads/1/3/0/7/130775388/gutumavaxero_bozobotumefoto_faxefaratanip_xegudamel.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/cpUwTYk/dragy_leaderboard_golf_r.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/pomunazano.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/fTHKia8/microsoft_onedrive_needed_at_startup.pdfIn PDF document text
    • https://soxuwewoduxewu.weebly.com/uploads/1/3/4/0/134042667/kinebasob.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwozobo/icgijiC/rasobixibeg.pdfIn PDF document text
    • https://vuvonuzomuvi.weebly.com/uploads/1/3/4/5/134508102/03048002.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/dell_ultra_hd_4k_monitor_p2415q.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/does_target_do_sodastream_refills.pdfIn PDF document text
    • http://gudituxubimof.22web.org/line_6_fbv_shortboard_mkii_dimensions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pozidijapepore.atwebpages.com/prohibido_enamorarse_de_adam_walker_2.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012b31.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12B31 20756 bytes
SHA-256: deda3c304ae21b4b35b272ac6c388fcea47bfcbb1e335c917797b786d8e92606
font_00_sfnt_off0000eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB00 5648 bytes
SHA-256: 01dfeeb4a050fe170614c9435d3e06e95c3e257eb366fc199ac179fecd4b78aa
font_01_sfnt_off0000fe40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 13884 bytes
SHA-256: f40e2f7c0c17e7b4500d40f0adfd2aa209e2b5560585c0abc1e503986ee811ad

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