Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed51757c28239c84…

MALICIOUS

PDF

68.5 KB Created: 2021-02-04 12:56:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d52aa7d74123175e41b94748d62ed560 SHA-1: 95b1e237c618c501337caa7086259dc27be42b81 SHA-256: ed51757c28239c844ffed29f0a6ae39a973b378b4cbe0212e9f30245958d0ce0
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious content, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect the user to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://yafferge.ru/aws?utm_term=street+fighter+2+full+movie In PDF document text
    • https://cdn.sqhk.co/kasuwajavi/Uzhebjg/97835924040.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449178/normal_5fde2ec0b7164.pdfIn PDF document text
    • http://dithetsen.xyz/viladogefilipumutwf8.pdfIn PDF document text
    • http://itali-big.space/234461492858qelz.pdfIn PDF document text
    • https://pabaxugu.weebly.com/uploads/1/3/2/6/132695470/8352667c26.pdfIn PDF document text
    • https://sisezapude.weebly.com/uploads/1/3/1/3/131398367/buxix.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/fd99af7.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/zamuriza/zarovaraketenotixerul.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/a5_booklet_template_illustrator.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/report_copyright_infringement_to_disney.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/pekefesafowimip.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/greeting_card_printable_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/challa_song_amrita_virk.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_off0000d0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BA 5088 bytes
SHA-256: fbd89be79c7907db050e64edb32e16a1f24be899ea0a0023d3ac444d23cd12e9
font_01_sfnt_off0000e1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F1 10344 bytes
SHA-256: 1b6382193d9215561ee64f28d146d5a986d608688b231ed65fc33bbc0d032306

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