Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b09506ea33b1cd…

MALICIOUS

PDF

69.1 KB Created: 2021-02-06 21:36:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 9a39bc5eb497be5d14a17d6e56daaa95 SHA-1: 490f6b6881814742a2ef48c8c9c84e58726398d7 SHA-256: 57b09506ea33b1cdd88b5cfcd5c0db4a39241ac21c1cbbe88ea76041136358af
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/wb?keyword=office%20id%20card%20template%20free In PDF document text
    • https://static.s123-cdn-static.com/uploads/4463794/normal_5fcf76ff49bf6.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/hckhaQ5/paper_wings_otr.pdfIn PDF document text
    • https://cdn.sqhk.co/seladati/jdxbTgg/70610523205.pdfIn PDF document text
    • https://bogigusojuvifu.weebly.com/uploads/1/3/4/3/134316749/puwefanufonu_pusagutomedas_fesomidopibone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482405/normal_600eca8de9974.pdfIn PDF document text
    • https://xuboxale.weebly.com/uploads/1/3/1/4/131452808/libigufe-zumamobirun-jupof-zumiwopod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375907/normal_5fde23d1270b0.pdfIn PDF document text
    • https://cdn.sqhk.co/zivudasexoni/UV3khbl/xamibupegag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_600a271d6f4fd.pdfIn PDF document text
    • https://cdn.sqhk.co/lasukojizix/jjielKw/cyber_hunter_pc_hack_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/ieKhijf/tribal_mania_offline_mod_apk_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479715/normal_5fe0656a62cf3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fukibas.epizy.com/bulbul_pakhi_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/10096975239.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/49983901304.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_off0000d340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD340 5152 bytes
SHA-256: b422184cedde66e980c6d3070d76b0e265334f7967f6d4fc39266b8a2d677a52
font_01_sfnt_off0000e4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 10272 bytes
SHA-256: d7e27d35a44f52917ffe28b4ce77e6a8a72e58ad5a618dee1036514bbdfc7b8d