Malicious PDF — malware analysis report

Static analysis result for SHA-256 a051b9b27d8454f2…

MALICIOUS

PDF

73.3 KB Created: 2021-01-31 08:00:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: b1e060b69ccee69f7861ae5911adc555 SHA-1: 01d6791f3b2d89449925949ad3a09723cce3a7d9 SHA-256: a051b9b27d8454f26d841ed615057e3093f6c24c1a1f67eaaf3c3b0366c4c2d7
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=conclusion+for+industrial+training+report In PDF document text
    • https://static.s123-cdn-static.com/uploads/4499999/normal_5ff0d5e54161f.pdfIn PDF document text
    • https://goradexajegofip.weebly.com/uploads/1/3/0/8/130874122/9376671.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500904/normal_5ff8da53d414e.pdfIn PDF document text
    • https://cdn.sqhk.co/nafadurip/jaV7lcM/46003511987.pdfIn PDF document text
    • https://zopojezumaze.weebly.com/uploads/1/3/1/6/131637354/torawi-xafubebibu-xarejul.pdfIn PDF document text
    • https://tefovaxosu.weebly.com/uploads/1/3/1/1/131163863/lawez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408864/normal_5fd15306bfbe6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371005/normal_5ff45e7627b5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445341/normal_5fe9b5e00b0a2.pdfIn PDF document text
    • https://cdn.sqhk.co/derepinejabi/2RghZij/jiguwob.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/leteraxewe/yoga_at_home_for_beginners_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/vituxu.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/59728519680.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/9764957864.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/febujidaso.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_off0000e1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D6 5228 bytes
SHA-256: 3c6445031902bf40ae27d2b83844be2ae0da1ae9ec253b9fb8a3569b4ec18134
font_01_sfnt_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 11112 bytes
SHA-256: 88f9f8ae718e42b9200f35ecd883101fe70ecfc1113080ad09cf767f5e0f6678

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