Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f68b6862e76e07e…

MALICIOUS

PDF

73.4 KB Created: 2021-02-11 20:48:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 254809d928f11acd97b6819a0f49e5c2 SHA-1: f402eada3f67a571038adfc2734f92d2602a3c86 SHA-256: 8f68b6862e76e07e82b48f37979cbcc38306cf4993996b538ff8370e7ca782d4
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure at `https://crophysi.ru/wix?keyword=worx+chainsaw+manual+wg309`. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure and numerous links suggest an attempt to direct users to malicious content, likely for phishing or malware delivery.

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://crophysi.ru/wix?keyword=worx+chainsaw+manual+wg309 In PDF document text
    • http://iuts.space/fumevaocr9r.pdfIn PDF document text
    • http://sarelalitodidi.66ghz.com/cities_skylines_for_android.pdfIn PDF document text
    • http://shoplus.info/jotuvefiposuzobezogqwono.pdfIn PDF document text
    • http://theharaka.online/fuzonaj2ndr.pdfIn PDF document text
    • http://nosinoski.shop/dubapinavv1ts.pdfIn PDF document text
    • http://itchia.space/murigosogotawerovz9.pdfIn PDF document text
    • http://kieverts.xyz/firefox_file_limitl0lqo.pdfIn PDF document text
    • https://vataripisak.weebly.com/uploads/1/3/4/6/134600115/9fd57.pdfIn PDF document text
    • http://hamsterbig.com/minecraft_minigames_server_mapn4v7y.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/lanubili/outlook_2016_setup_email_template.pdfIn PDF document text
    • http://kujafugakare.epizy.com/vufidimagurikaje.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/mopagazetezomoxexelidiloz.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/how_to_get_ruler_guides_in_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/church_information_card.pdfIn PDF document text
    • http://duwutejuvozow.rf.gd/bharat_movie_filmywap._io.pdfIn PDF document text
    • http://gagisejokunego.rf.gd/dazilelopozenenetobebiw.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_off0000d5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F7 5848 bytes
SHA-256: 82e9f9f69820a20e57bef17b989ffac579163b1b89b0e955203322beb7a1d5ef
font_01_sfnt_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 15120 bytes
SHA-256: 1984a193d2284348637cfa2cca3a156f49de2d2c3ffac6a9f1e6646f5b789b9a

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