Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac23b634393365b…

MALICIOUS

PDF

78.1 KB Created: 2021-02-04 05:57:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6dc5db08e5f616778450707d633b7bed SHA-1: 7302169746f898b44912e7ebcf32ecfedf05141c SHA-256: dac23b634393365b70a5c102a4edd090de17b2d80fafec5cdd068fbf28e0ea23
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 'crophysi.ru'. This URL is likely used to host phishing content or distribute further malware. The ML classifier and ClamAV also strongly indicate maliciousness. Although no scripts were extracted, the presence of a malicious URL within the document body suggests an attempt to trick the user into navigating to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=snapchat+dog+filter+download+apk In PDF document text
    • https://static.s123-cdn-static.com/uploads/4473035/normal_5ff64db7a1fbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366633/normal_5fc6928258bdb.pdfIn PDF document text
    • http://mastericy-chistoty.ru/jumpstart_learning_games_downloadchn4f.pdfIn PDF document text
    • http://instgramcopyrightdispute.com/vivipurocnh37.pdfIn PDF document text
    • http://subikizivuwen.22web.org/rodazagubetasujodim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379219/normal_5fd7d702700f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457881/normal_5feb0120d3e02.pdfIn PDF document text
    • http://marinarus.space/dangerous_prayers_for_breakthroughd81nn.pdfIn PDF document text
    • http://scoretdho.best/kirke_madeline_miller2kk88.pdfIn PDF document text
    • http://cherrypimp.online/kitadunabupinovetumabopueqfyh.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/laparazudovibodadubuqns7.pdfIn PDF document text
    • http://marketitaly.info/47005152426copqo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475586/normal_5fe50e7316149.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380382/normal_5fcc38ed079a9.pdfIn PDF document text
    • http://xafukuxovikovu.22web.org/bachelor_of_business_information_systems_in_canada.pdfIn PDF document text
    • http://nefritthebestthing.site/gba_emulator_free_onlineodfoc.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/mukutud/repepejutavoj.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/94773489271.pdfIn PDF document text
    • http://tidefos.epizy.com/juselopekupotamu.pdfIn PDF document text
    • http://xuvufajozurez.rf.gd/ansys_acoustic_tutorial.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 5496 bytes
SHA-256: ebbfe3278de6bff73fdb98c4e01bf8879fab5d8372e41606456afba9a4cff99d
font_01_sfnt_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 12716 bytes
SHA-256: c76efc54cd57ab0952d93af6043944633e984eeed8779c648bde03051a97feb2
font_02_sfnt_off00011676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550

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