Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91e32a64623ce5c…

MALICIOUS

PDF

86.0 KB Created: 2021-02-18 16:13:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 842325facc2ae2240f6f016aeaca8e05 SHA-1: 8c4b7157564e471e6bf333b391c6572709ce13b8 SHA-256: c91e32a64623ce5c39dc33b9c9df8c4c14ccf415acf67eea9d6581584efe02ed
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, identified by heuristics as a malicious redirector. The ML classifier and ClamAV also flagged this PDF as malicious, specifically noting phishing and trojan characteristics. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to deliver a malicious payload or phish credentials.

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://yafferge.ru/strik?utm_term=memento+mori+ring+skull+gold In PDF document text
    • http://cosmostil.top/74461421244se0qn.pdfIn PDF document text
    • http://pollsexpert.com/setool_box_freetuxup.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/jjjbhrb/88052388513.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/FEMiche/aimpoint_pro_patrol_vs_eotech_512.pdfIn PDF document text
    • http://1-bog.ru/maroon_5_maps_mp4_song_freeqkej5.pdfIn PDF document text
    • https://cdn.sqhk.co/nerurepaza/8QicLje/51759338567.pdfIn PDF document text
    • http://kozlo.space/aires._dll_cs67q3zt.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/vipuxafol/91990149466.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/bivujipuvilobasagoladux.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/86307672127.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/adding_bleed_and_crop_marks_to.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/medulefodujoka.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/80395524355.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/zomalakazowovesepovo.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/bidux.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/18770969325.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/pufivomixolotonofofemomeb.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011e4e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11E4E 25140 bytes
SHA-256: c3199b16c0c1e120b4a8d0e339d859ca5554d6aaff63603e6dc03c5e18e45fd2
font_00_sfnt_off0000e9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 5004 bytes
SHA-256: 74092937cd49ec42f05fee1b2cb1ff7b3fba9494b88c677102c6d210aa05c987
font_01_sfnt_off0000faff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFF 10252 bytes
SHA-256: 86ced952380f906bc630bc7185a7caad3370e2aefdeea2a253ebf7655e03bddb

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