Malicious PDF — malware analysis report

Static analysis result for SHA-256 997e76f72ff49b49…

MALICIOUS

PDF

85.3 KB Created: 2021-03-14 18:57:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: bf879d95a614ec275daa410bde66e555 SHA-1: e79cba7da2680bb98741ef353f60e53ef1c2b44d SHA-256: 997e76f72ff49b49eb776cfd025673e82d6c17c3ec417f84d7b9112dbde5ac6b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier also strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/123?utm_term=canciones+de+rock+para+guitarra+acustica+pdf PDF link annotation
    • https://cdn.sqhk.co/pategazikiw/iafidhj/53378430629.pdfIn PDF document text
    • http://jatepemiv.22web.org/27667385152.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/jd4ibij/badland_brawl_hack_apk_download.pdfIn PDF document text
    • http://tryplafond.xyz/esl_business_english_conversation24kju.pdfIn PDF document text
    • https://susotavawo.weebly.com/uploads/1/3/5/3/135325365/1ca570f04a4d.pdfIn PDF document text
    • https://cdn.sqhk.co/rapavuse/cgfjhhc/78721515620.pdfIn PDF document text
    • http://formulamoney.top/488385387624m7a6.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/eificji/intelligent_hub_app_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/jimikafede/hhjdjrN/wood_cutter_game_online.pdfIn PDF document text
    • http://graatorama.fun/5g_mobile_and_wireless_communications_technology_book4qhrn.pdfIn PDF document text
    • https://porukugo.weebly.com/uploads/1/3/1/3/131380087/firaduw.pdfIn PDF document text
    • http://merovew.xyz/el_aleph_jorge_luis_borges_cuentos_latinoamericanos519ln.pdfIn PDF document text
    • https://xoravali.weebly.com/uploads/1/3/0/7/130775395/768a62.pdfIn PDF document text
    • https://cdn.sqhk.co/faxinomitux/hdjb7hc/romoxuri.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/9hdjghj/kindle_app_won_t_new_books.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b225a471-051e-48b0-8e26-ff70d5137b27/votadavot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf797af7-0a22-4ff7-920e-62db100656bd/how_to_remove_printhead_hp_6968.pdfIn PDF document text
    • http://dawonudugol.rf.gd/oxford_word_skills_intermediate.pdfIn PDF document text
    • http://merizipu.rf.gd/python_selenium_chrome_headless.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001001c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001C 5260 bytes
SHA-256: 803e98a3314af411bb7f9974e67cf2e38f0f0dd8eb9e9e78340ea9e360274ea2
font_01_sfnt_off00011206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11206 1888 bytes
SHA-256: ac14972b7b2947834c866a693307dd83921f9e40fad0e2ab592cecd13463aa54
font_02_sfnt_off00011b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B19 12832 bytes
SHA-256: 023a3e7563c5a7d4ed902dff4e99b0dc26fef1adf1c8c3f97ac7646c82979d99

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