Malicious PDF — malware analysis report

Static analysis result for SHA-256 440872f43ac4a9e2…

MALICIOUS

PDF

40.0 KB Created: 2020-10-04 02:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: dfc9e2a78c7846c06e02fc0d03880119 SHA-1: 6cb1375fa96d9fe2b7604dd279444aeccb534642 SHA-256: 440872f43ac4a9e202a93ab3720e596e18b4afd1d3e1aca90e47fa0092ffe9a5
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://cctraff.ru/strik?keyword=formato+cedula+venezolana+editable In PDF document text
    • http://reroruxom.vtrootsmigration.org/uploads/1/3/1/1/131163857/zepalegenifi.pdfIn PDF document text
    • http://jinejavi.avucchella.com/uploads/1/3/1/3/131383837/zowukov.pdfIn PDF document text
    • http://files.donatticbd.com/uploads/1/3/2/8/132815014/puripokuxawomuron.pdfIn PDF document text
    • http://files.vfpbellingham.org/uploads/1/3/0/7/130739758/gugawikexina.pdfIn PDF document text
    • https://site-1038779.mozfiles.com/files/1038779/sewukekuvomaro.pdfIn PDF document text
    • https://site-1038946.mozfiles.com/files/1038946/47963114793.pdfIn PDF document text
    • https://site-1036894.mozfiles.com/files/1036894/tefapolanalipebidavozowes.pdfIn PDF document text
    • https://site-1040687.mozfiles.com/files/1040687/xewores.pdfIn PDF document text
    • https://site-1037094.mozfiles.com/files/1037094/dejetutuvug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5752/8480/files/icd_10_code_for_alcoholic_ketoacidosis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0756/5209/files/tidagomaxakevimenoti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7895/4389/files/soruvemuxadogimiratebutun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2112/2211/files/duvut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1016/5408/files/veligukupuviwapuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c8d785a-ea3f-4974-a58e-9f70df644989/zafuwiremoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead191c9-050a-4506-8726-44db2ffac322/xukovebegilideme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ed64be8-bd7d-414b-87b2-e0333b925c93/xazuzosivek.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000502d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x502D 4996 bytes
SHA-256: 29a0212b09eac4452d9bcfff3d2caa9eb011042b4dfadc2dfe32b31f29f3a2bb
font_01_sfnt_off00006112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6112 10904 bytes
SHA-256: 167f9f5f83b6006455f4df50a890ffdf38dd687292e0dd35e5f427af05f35d1f
font_02_sfnt_off00008496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8496 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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