Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ed6d0887a1c472…

MALICIOUS

PDF

49.5 KB Created: 2020-09-30 02:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 8d19a6f4698e4a7f63ee2b27b22b5146 SHA-1: 80dde5d575f7564d01c5ca6282fd7df28a909ebd SHA-256: 37ed6d0887a1c47204c1ac9270bfe50cce59be5b2d5a1c391ff629a78f21bf05
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://ggtraff.ru/strik?keyword=absorcion+de+lipidos+pdf In PDF document text
    • http://files.scubadivingperhentian.com/uploads/1/3/1/0/131070520/denowiv-dijaw.pdfIn PDF document text
    • http://files.maynardsdoco.com/uploads/1/3/2/3/132303410/2753768.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/f878cd53-7c16-480c-abad-e51682f1a4dc/xutesepekupepanagoduru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8de62626-e8be-44ff-83ce-3744818bff82/17512372153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f32e1ad4-4a82-4452-9577-128aafd33ff7/kubup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd5421b1-ee60-418e-aea7-90e20841eb71/77022898315.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/2218/3331/files/vibemi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6953/7432/files/learn_to_fly_2_unblocked_fun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/golalebilafofuzugetuvi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/4267/0245/files/tesib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cae21564-f5b4-49d0-9077-3afd04c49029/30536394282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13640d59-d5d6-4d1f-a854-ef2544145f27/guxijibonot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81ea364-be00-4f44-8120-d45bf3aa25e7/voxenine.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_off000083f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83F6 5068 bytes
SHA-256: 4383a8f41c873d60bff0a119a942ca4f5aaba4ef67edc0b8eab4be2bcbb6754d
font_01_sfnt_off0000953c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x953C 10644 bytes
SHA-256: bf6931b0780420869fcbb6c88ae0c9cf98d24c7912c72cdd5b534944a7f42535

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