Malicious PDF — malware analysis report

Static analysis result for SHA-256 171b75b2c427ed88…

MALICIOUS

PDF

68.8 KB Created: 2021-02-21 23:20:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 3af2b060e9a28141299d4141413f3b1b SHA-1: 557f89baea617bb994518a03010ad499245a1a01 SHA-256: 171b75b2c427ed8850f607f30c951e0cb22ce7018797c3e2026f3f52e5309c9e
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=plumber+south+eastern+suburbs+melbourne In PDF document text
    • https://cdn.sqhk.co/vipabumumiw/hiidSjg/18365379454.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496571/normal_6001116bcf988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451970/normal_5fd0bf05cd423.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412778/normal_5ff4cb61b9538.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468531/normal_5fcd339073b1c.pdfIn PDF document text
    • https://diwosilanula.weebly.com/uploads/1/3/4/7/134765308/22587b7b20b.pdfIn PDF document text
    • https://cdn.sqhk.co/detazido/ij05Bib/livisevemosofatubanidupuk.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuxopova/T0Vb9hf/31394127615.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/esiaCkA/47298465271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501656/normal_600c7cf54005a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416331/normal_5fca461aa8df8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412158/normal_5ff081e66560b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369911/normal_600badf960e24.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/wujafivabipo/software_test_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/favojos.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/pewikafar.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/android_9_easter_egg_pixel_2.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/guxonenirubib.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_off0000d21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21A 5064 bytes
SHA-256: 534641f31add10c8839800f6fd42a3787dda9d84910f8e60b7f63b125d7d1489
font_01_sfnt_off0000e320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE320 10648 bytes
SHA-256: 39aeb6c58d52d9a9b1c021bec7624085c2408c751747345ce4ee8c1cb6f1cdc3

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