Malicious PDF — malware analysis report

Static analysis result for SHA-256 51884ec67dabc12c…

MALICIOUS

PDF

78.3 KB Created: 2021-04-04 19:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 8e1332a5baca4da10e486390ca317985 SHA-1: 9d4777bb9f70aa343a127bdca8ad394b0429774d SHA-256: 51884ec67dabc12c6693e40166bc672a09ff9ca8a0c9b643b60a0605b1da0198
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, including one pointing to vilenefex.ru, suggesting it's used for phishing or distributing further malware. The document body, though heavily obfuscated, appears to be a lure related to adjusting a light switch.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=how+to+adjust+a+lutron+motion+sensor+light+switch PDF link annotation
    • http://devgm.design/why_does_my_snowblower_not_startpppf3.pdfIn PDF document text
    • http://quickpapp.online/61407407906r59is.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/SdhPibt/xasinexurivowosanotosuto.pdfIn PDF document text
    • http://samafutanub.mypressonline.com/gaxobosejoferegoluguz.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/hbibhgc/87528995614.pdfIn PDF document text
    • https://gewefasawetuje.weebly.com/uploads/1/3/5/3/135315234/3365502.pdfIn PDF document text
    • https://cdn.sqhk.co/jatobeguji/Suie1if/cute_diy_popsockets.pdfIn PDF document text
    • http://kungfumalibu.com/practical_haematology_free_downloadkq8zn.pdfIn PDF document text
    • http://creampiepow.club/lenovo_y500_laptop_price1tiv0.pdfIn PDF document text
    • https://rekakugiraki.weebly.com/uploads/1/3/4/6/134623504/pavajotufutixejexoru.pdfIn PDF document text
    • https://pabibajezejav.weebly.com/uploads/1/3/5/3/135323938/xuwibimukolukutum.pdfIn PDF document text
    • http://antonioit.fun/cyperus_odoratus2d0oj.pdfIn PDF document text
    • https://cdn.sqhk.co/luvutagawata/jgLijyQ/resident_evil_movie_in_tamil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_493a9d5e316a447683d111d9a8dc2df8.pdf?index=trueIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/59444807674.pdfIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_7229ecac716441ae8eb90db944bf2c19.pdf?index=trueIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_e166516bd7a24144bd293c668312e873.pdf?index=trueIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_b4ccea4379d3411283b245e0ad1e0d5f.pdf?index=trueIn PDF document text
    • https://9e6c4f0b-3406-4274-bf8a-5be7f948d240.filesusr.com/ugd/45c6ff_de2582967c384f619e1c3bebf24cecf9.pdf?index=trueIn 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_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 5480 bytes
SHA-256: b2a19c3cb79fa95cdd80041f01206cca2ef24d530d8d91776ee7457d080f8f1f
font_01_sfnt_off00010742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 10800 bytes
SHA-256: a300a4c88be6bf3d58118174e973d0f557953104681d80eb4a1b41be9795d4c4

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