Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8597e837ba3099…

MALICIOUS

PDF

47.5 KB Created: 2020-11-09 13:10:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 57887a2e70c09ce8a1032a5a7f54836b SHA-1: be77b66dfb01d5dbf0a1c280fb63ce3c6de855bd SHA-256: cc8597e837ba3099500c0d1ab0c754a5dde12a3b23083861ad80b82e4afde6f9
152 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/aws?keyword=meme+maker+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422909/normal_5fa0c525b0ec4.pdfIn PDF document text
    • https://sidujojuwizubal.weebly.com/uploads/1/3/4/5/134587716/gezaruv.pdfIn PDF document text
    • https://xidalivukudupet.weebly.com/uploads/1/3/4/3/134319957/wonunufesujalik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384152/normal_5f8bf20e43dc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487625/normal_5fa813bf21221.pdfIn PDF document text
    • https://danawejenig.weebly.com/uploads/1/3/4/4/134499985/2b7b5eba83db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380072/normal_5fa81768d6ccd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369310/normal_5f87af78b8b32.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/vokeri/89132085115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b00d33d9-7bc2-4ecc-a959-9b13c95e4cbd/77011730389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb40a2ca-5218-4bc8-a99d-082dde551885/earn_to_die_2012_part_2_poki.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/us_open_tennis_2018_draws.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/80453246114.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/formato_de_solicitud_de_empleo_para_rellenar.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6390 4824 bytes
SHA-256: f48c92420a57f4b4c3a6dc0818710dcd9c48663fd988711a1e09a368fb638bdd
font_01_sfnt_off000073ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73EE 12164 bytes
SHA-256: 56a0e012f417ebb24c153355bc91b35d36c7f89f31f9a00238bc8631d81d2ea9
font_02_sfnt_off00009c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C29 16140 bytes
SHA-256: 1ffca1ef16be5e2ec436e77f9211a88ad3199dc781cb76600401cc2e2c7dce6d

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