Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbec9ca1993cf04…

MALICIOUS

PDF

68.3 KB Created: 2021-01-22 12:18:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: dea45cfc7c4c925d8b8cf8ac80c63900 SHA-1: a8211fdc4a7ff33d480862f40f6a641321c4264d SHA-256: 9cbec9ca1993cf04c8eb87aa02c7e73fb367b866faf78ff64cb64984644554c1
270 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=kumudam+reporter+september+2019 In PDF document text
    • https://cdn.sqhk.co/widexerun/fhg6haJ/vabinunaxesufuwuzoti.pdfIn PDF document text
    • https://japafapu.weebly.com/uploads/1/3/1/4/131437770/kubuke.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/hbhjohu/bunny_follow_and_like_for_tiktok_apk.pdfIn PDF document text
    • https://nebelifufenav.weebly.com/uploads/1/3/1/4/131437331/3369140.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/VxoeKjP/48096855689.pdfIn PDF document text
    • https://cdn.sqhk.co/dosijowikul/d5jdifL/vimaxomobof.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/davolazupivowi/5682429112.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/free_second_grade_addition_with_regrouping_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/english_synonyms_list.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/27271719412.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/xokowiwedibijiwizebamok.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/99544820349.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/illustrator_cc_template_layer.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/xotebupeduponifikozumive.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/xezatenonotebiruge.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_off0000cb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB60 5664 bytes
SHA-256: 7a02638c1161d26a813c0f4578926eec52d55383839831f62a6bcdc32f703d56
font_01_sfnt_off0000de81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE81 11068 bytes
SHA-256: 837864eb77ed015d3bf2d23153eba4a092b22552006b14660490f08c330cba94