Malicious PDF — malware analysis report

Static analysis result for SHA-256 8399d23144391432…

MALICIOUS

PDF

89.5 KB Created: 2021-02-13 13:19:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 47ec7d37f2a418a1cd6f9b2d919c583b SHA-1: 38e35e886db11b5a6b9b6fcd74033d2f54d42d10 SHA-256: 8399d23144391432c25dbab2aa6aeba5061a1b176415bdc5709a52a4aabbc805
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=aruvam%20movie%20%20in%20tamil%20isaimini In PDF document text
    • http://tuworiki.22web.org/sotogijuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458854/normal_601b4325a4479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485435/normal_601b4b3153425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409818/normal_601639eaadd8b.pdfIn PDF document text
    • https://cdn.sqhk.co/kelulegawi/Pgjidij/67636944911.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415543/normal_5ffd1c87e3d01.pdfIn PDF document text
    • https://jezuvafu.weebly.com/uploads/1/3/5/3/135348480/4231276.pdfIn PDF document text
    • https://xulakuvoloja.weebly.com/uploads/1/3/0/8/130813987/vopobi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366652/normal_6000e466c69c0.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/dazutun/android_phones_under_15000_in_nepal.pdfIn PDF document text
    • http://pijofabuzipa.rf.gd/aws_firehose_lambda_transform.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/ernest_acheampong_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/35060478377.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/ruduletiterebusezisa.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/podilewuse.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_off000120ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AB 4880 bytes
SHA-256: 39dcec74699ce32acada6d650efc5283f538ec01c796e3e4b89d904e1f821696
font_01_sfnt_off0001312d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312D 11796 bytes
SHA-256: c6ad3b9647cd3d12a8e8a2704788e12940451672f8b87c0a07f33b4aa501ecce

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