Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4556a3f4f396213…

MALICIOUS

PDF

40.5 KB Created: 2020-11-06 07:07:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: b52691a88ea4bca6eb832357f11c28ed SHA-1: 3013d45ebe2470cc133c616dcd879146b0711588 SHA-256: f4556a3f4f39621307cf4c89472e8e187aeef1aafa45656f634326b2aa26618e
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/aws?keyword=st+mary+community+center PDF link annotation
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/bedabug.pdfIn PDF document text
    • https://welerenumabo.weebly.com/uploads/1/3/4/4/134467224/1744901.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/7ef482e735654.pdfIn PDF document text
    • https://xomevore.weebly.com/uploads/1/3/4/3/134346529/safolelo.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/a7baa3905.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/970fcca2.pdfIn PDF document text
    • https://mulelene.weebly.com/uploads/1/3/4/4/134440938/4089613.pdfIn PDF document text
    • https://vokozigaga.weebly.com/uploads/1/3/4/3/134316184/4315124.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/jikopot/printable_certificates.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/spelling_bee_grade_8_word_list.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/zorunidowilubep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d617a5-a34c-41d6-babd-4fd8160e5ece/lobijobegulopanivarate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/688715a5-0175-4b59-a3b6-01db518b963f/98212311885.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/frigidaire_affinity_dryer_aeq6000es2_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efaeb3ff-f08f-4eaa-80b8-8816198e6917/76294899071.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d0faadd-1294-4d43-b83d-6816746e7f49/best_buy_scanner_price.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/50402407331.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_off00005df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF7 4940 bytes
SHA-256: af815260d91f9ebb1c3a6152d374550d68deeb57ec4d9bd595567cb7f6e1ce3a
font_01_sfnt_off00006eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB4 11100 bytes
SHA-256: e16f9e971095edc5c47c43c099fd485fe48afadb8ee55f7cdd819c171f0981af

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