Malicious PDF — malware analysis report

Static analysis result for SHA-256 9674b36eea95750a…

MALICIOUS

PDF

74.2 KB Created: 2021-02-05 06:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f35245a3baebdeb71d655760477fe74b SHA-1: 56ca4dfab1ea641735ee30ba8dddfcc48a6d4130 SHA-256: 9674b36eea95750ae67e208bb1bcbf2b8021845f6bb812db322dacf01f9b8723
154 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical finding for a PDF redirector link pointing to 'https://crophysi.ru/aws?utm_term=bridget+everett+song'. The ML classifier also strongly flagged this PDF. The embedded URLs suggest an attempt to lure the user to external malicious content, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=bridget+everett+song In PDF document text
    • https://cdn.sqhk.co/sebutarukaw/8LhdiaU/ziwuzosivotamojod.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/gev6b6u/fiwovunikoraxalewozi.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/gghfOsg/mojawesugemugogarirogos.pdfIn PDF document text
    • https://cdn.sqhk.co/lufezeralon/cGgXjVe/tofenixufokizuradaki.pdfIn PDF document text
    • http://ionatr.fun/69767189260bhv9g.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/YgeGgdF/51769230680.pdfIn PDF document text
    • http://newberginvestmentproperty.com/band_of_brothers_book_stephen_ambroseinfv4.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/mejigavukolu/calendar_template_2019-_20_school_year.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/atharva_tamil_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/brother_embroidery_machine_pe800_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/53278105355.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/sakodusupukarutufuwof.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/affine_transformation_python_points.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_off0000e107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 4860 bytes
SHA-256: dee97d07228aaf4e3fde3598bf30c5021a0c5459898829a7586c1c67a1379520
font_01_sfnt_off0000f1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 13160 bytes
SHA-256: 9bc44a8c79adb32f50197a639462523ada56dd3a22185bd4949710e1918b347c

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