Malicious PDF — malware analysis report

Static analysis result for SHA-256 daaa9f5bfa0aa36c…

MALICIOUS

PDF

75.7 KB Created: 2021-04-05 14:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ea49252ea0ecb9e7e427dd7126c0779a SHA-1: 4d395b79f6dbe48c3f7b70d0f6865f0ee30e47d5 SHA-256: daaa9f5bfa0aa36c7698ee1c7fb1691c73b0fc4dafb96b221959fc7652c06eae
252 Risk Score

Malware Insights

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

This PDF document contains a high number of embedded links, many of which point to suspicious or known malicious redirector domains. The heuristic firings indicate it's designed as a link farm and uses invisible links to lure victims. The ML classifier also flagged it as malicious, supporting the phishing and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8479

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://yafferge.ru/strik?utm_term=which+score+is+better+act+or+sat In PDF document text
    • http://pshcomonhere.xyz/postman_usage_guide0qrpd.pdfIn PDF document text
    • http://gukevipagopu.mywebcommunity.org/advocates_remuneration_order_2020.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/4th_grade_grammar_practiceaq7y0.pdfIn PDF document text
    • http://netewe9.xyz/34160127775ovx3d.pdfIn PDF document text
    • http://tepoparupomo.medianewsonline.com/couch_to_5k_running_plan.pdfIn PDF document text
    • http://zabovawupe.mypressonline.com/fezizanorepogajupab.pdfIn PDF document text
    • http://dabezogo.22web.org/dofikunu.pdfIn PDF document text
    • http://top-shop-store.website/jekagepifs20f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dasupepu.epizy.com/object_oriented_programming_concepts_java_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/uc_browser_java_application_free.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_851ebb33bf5e45f1b84e0b2a9728bf46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/harry_potter_movies_order_of_the_phoenix_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/cisco_webex_add_on_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/tv_guide_dstv_supersport_4.pdfIn PDF document text
    • https://62bfe9e3-d01a-456c-9d14-3ac71290fd99.filesusr.com/ugd/cfe640_f5ac7e5e5e204b87b976881d5b3c4b19.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/para_angariar_fundos_de_formatura_os_cadetes.pdfIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_b65ceb1b4e254d7fbfef9d950601c8e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gozifep/22186202430.pdfIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_8a7b66463df040018a71679e7769d99c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/messenger_old_version_ios.pdfIn PDF document text
    • http://jaweratiz.atwebpages.com/definicion_de_polisacaridos.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/36131793708.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 5008 bytes
SHA-256: 15f1e6fa381d25325cc3124ead41115f521e3c175591601ad899187d0c0cdf29

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