Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3b685b6483cd79…

MALICIOUS

PDF

47.3 KB Created: 2020-11-06 19:04:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: a2a3fde33316742a9392b18209c7dada SHA-1: 9ae98cad474aec4f280b11a72f2fad51c2930f7f SHA-256: 3c3b685b6483cd792dccf55fa5ccf25ef76d4356eb2102786825b452c9137b8d
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://trafficel.ru/123?keyword=free+lightroom+alternatives+2019 PDF link annotation
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/latumale-winilig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388272/normal_5f8ff208276ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375884/normal_5f8d25077cdbb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e79dcc67-ba1d-4514-9eee-96b27645f07c/xinumoninopogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cbd8cef-3228-4461-862a-cc68f28f6163/suzuha_letter_steins_gate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86a85901-9445-4689-8e2b-537705a4cf24/68475033556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f8ddbb6-a27d-42d5-8594-3a00ec64c814/95061883945.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/57249645906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1df5ad16-56ed-4738-b2aa-2ce52d64e522/zulafipuselerazer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f00b3c4-5259-4cd4-966e-69c4749d7b97/53569278162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b54a697-fa4f-434c-9f9e-12a3ce8df009/xupewajipufezexabom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8f38c0e-11b2-44f1-99b7-929e43a75f10/kiwoditalirokejafalusoxo.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_off000060e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E2 5596 bytes
SHA-256: cb9a8285faf25dbe3b4738c566c316b7871df5292c28a2ececf1d0ac26fded22
font_01_sfnt_off000073bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73BF 11600 bytes
SHA-256: bef384d83b569376a7c8f0c7089f23bb79606d5dd2a3164665f94992e7cf12d3
font_02_sfnt_off00009b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B77 16100 bytes
SHA-256: 97e21a041ba5ea5da2cc398aa24b73e99ff23eca821de32fcd4750db29967c3c

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