Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1bc61e03913b64…

MALICIOUS

PDF

72.0 KB Created: 2021-01-25 10:16:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: c14d48df35a49a0a6710bff730abe897 SHA-1: 636c01c7e45a47e19cd12c60d1d555fdefb9a967 SHA-256: 3d1bc61e03913b64fd4d10e1d698c887cb7193a4a720da2d80f671a986a2cec2
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://yafferge.ru/shook?utm_term=battle+angel+alita+movie+trailer In PDF document text
    • https://cdn-cms.f-static.net/uploads/4463794/normal_5fd1d607b1d40.pdfIn PDF document text
    • https://fipugodegiposal.weebly.com/uploads/1/3/4/6/134687615/1273509.pdfIn PDF document text
    • http://regsenatvumen.website/heroic_fighter_research_timezvtwt.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/53918287993iapop.pdfIn PDF document text
    • http://sayfelengs.space/i_wish_grandpas_never_died_acoustic_chordsi2whd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_5fd72d1304ce9.pdfIn PDF document text
    • https://mudagetani.weebly.com/uploads/1/3/4/3/134381332/e5aca760506c31d.pdfIn PDF document text
    • https://tijezelaxupoki.weebly.com/uploads/1/3/5/3/135340387/420013.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416506/normal_6003d3666a49e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rubuvajaroxe.epizy.com/cue_file_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/ramazabovanixidow.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/wows_acasta_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/63633058044.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/vusuxepiwizonarutenasuno.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/avistart_4103_manual.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_off0000dc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC43 4936 bytes
SHA-256: 1f73e2e845d7ed6c1209d0c7c7a77df9f255992a6696703c99e153526972affb
font_01_sfnt_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 11244 bytes
SHA-256: 8b7e5e0592528d49d154b951cdad90cc17824b8b3367996c4f133f3f6a95f0c6

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