Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd27ecf3fa54431…

MALICIOUS

PDF

77.8 KB Created: 2021-02-12 18:26:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 377da39a4546104fe8eb14f1f7c2b95c SHA-1: 211501e41310b337bbe685a3caf0b4723797a9f7 SHA-256: fcd27ecf3fa54431436ac70b21bd28c5237efc58831b8671f26d56077f8d1742
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/wb?keyword=modal%20verbs%20obligation%20worksheet'. This indicates the document's primary purpose is to lure the user to this external resource. The ML classifier and ClamAV also flagged this PDF as malicious, supporting the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://crophysi.ru/wb?keyword=modal%20verbs%20obligation%20worksheet In PDF document text
    • https://cdn.sqhk.co/dodazija/Fgehhgg/68009724783.pdfIn PDF document text
    • https://cdn.sqhk.co/kegetaxob/5NFOheN/fifabazafobi.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/leatherworking_classic_guideftjof.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/hshf3z8/difexebadoroxu.pdfIn PDF document text
    • http://ryukzak.digital/buchwald_couplingar0dk.pdfIn PDF document text
    • http://good-production9.site/parking_fine_appeal_letter_template_ukk9057.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisimak/giijhQ9/live_video_call_online_free_download.pdfIn PDF document text
    • http://retys.fun/terjemahan_novel_the_old_man_and_the_seaeh45q.pdfIn PDF document text
    • http://kind-insta.site/ziferuraboxagowaladomicy7hd.pdfIn PDF document text
    • https://cdn.sqhk.co/refevebux/hh0PMgc/turukagebug.pdfIn PDF document text
    • https://cdn.sqhk.co/lusimalifa/hi7qMhi/fitepumolik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/schedule_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/30415024773.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/xegatarijotoli.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/good_food_guide_voucher_list.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/lidajenimuga.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/fosexaxadomejakelad.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/75184356589.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/guardian_good_university_guide_architecture.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/tebuxenozeginafod.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 5448 bytes
SHA-256: 1b64f9c1d668ab2d517a96f4adee58513030abadfcfe6196aa25ba153b17532e
font_01_sfnt_off000106ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 10312 bytes
SHA-256: 940b18bf072b69fa8ce61c5f5dbeecdd4675e0981c69c4b331fefb1a4db17cee

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