Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31727b69e64d30f…

MALICIOUS

PDF

72.7 KB Created: 2021-03-20 12:07:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5b83f53d3476a17b3d0c53cc611fe82c SHA-1: 11be591af69ce2e4ac50a5223b6401716bcf63b2 SHA-256: e31727b69e64d30fa89b50c5e08c2d94a8513a059b67fe6c336e111d1092a995
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose appears to be directing users to a network of sites, likely for SEO spam or to host further malicious content.

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://resalured.ru/wix?keyword=2019+and+2020+school+calendar+dekalb+county PDF link annotation
    • https://cdn.sqhk.co/kavevanix/jf3mXjg/tesininorigipipotiv.pdfIn PDF document text
    • https://cdn.sqhk.co/tixuniwe/hDggicG/62822621455.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/EggKhjo/craftsman_gold_6._75_lawn_mower_parts_diagram.pdfIn PDF document text
    • https://cdn.sqhk.co/milagaleja/V2haSge/pogujevapidubokuvogapir.pdfIn PDF document text
    • http://ideal-it.fun/what_unusual_accident_happened_to_brainless_flunkalot_pizzazzfbqu3.pdfIn PDF document text
    • https://cdn.sqhk.co/lajojeletab/dthcHJN/13891518014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373753/normal_6037568b0b76c.pdfIn PDF document text
    • http://servicesforsupport.com/161382650138wql9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480399/normal_60412ab5a70c6.pdfIn PDF document text
    • http://itfamily.info/charlie_y_la_fbrica_de_chocolate_libro0r5lb.pdfIn PDF document text
    • https://cdn.sqhk.co/raserijene/jgNJ1gc/80600106566.pdfIn PDF document text
    • http://gradstroy.su/zavenuwarozesenugubugaparft0wy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444636/normal_6001219f798a7.pdfIn PDF document text
    • https://cdn.sqhk.co/luwosera/Tj3OibR/61838900221.pdfIn PDF document text
    • https://cdn.sqhk.co/mozulunilex/ZBTIVZR/download_game_fidget_spinner_mod_apk_android_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_6034385f14db4.pdfIn PDF document text
    • http://idealslim-ordina.site/jivelemilawedu8bfxf.pdfIn PDF document text
    • http://findssldz.xyz/manizedjj51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460449/normal_5fe7875ad99ca.pdfIn PDF document text
    • https://cdn.sqhk.co/savekedeg/nheig9i/apk_bobol_wifi_no_root_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_a75727a9578b46eeb2eb4f5075099872.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_off0000dc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6E 5720 bytes
SHA-256: df9527a3331e021ae084a27e5df24aeccbcd6d2019ae93fc591006093012d969
font_01_sfnt_off0000efe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 11160 bytes
SHA-256: 014b52e3fc60191e194922500dff08950b1944f77d9acf9fa4895e39aba6fcd0

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