Malicious PDF — malware analysis report

Static analysis result for SHA-256 378f7f2bd085382e…

MALICIOUS

PDF

65.3 KB Created: 2020-11-24 05:52:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d441cd4ed83407ef4c860097166fca4c SHA-1: 79864567154083ab0fc83c4dd2f4cc89eef54036 SHA-256: 378f7f2bd085382e21bf25f683bf4f8bf88c8452075f6c3476264625c84cc5ec
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'boxing games' and 'wkhtmltopdf', suggesting a lure to disguise the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=best+boxing+games
    • https://xajapeni.weebly.com/uploads/1/3/4/3/134341300/simuboriluge.pdf
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5f886460b2752.pdf
    • https://subefivu.weebly.com/uploads/1/3/4/6/134688636/xutolarade_wasibex.pdf
    • https://wemuxafav.weebly.com/uploads/1/3/4/8/134860001/3793458.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/623af46c-be8f-4a03-b21d-e08e30b6c877/ritz_carlton_assessment_test_answers.pdf
    • https://uploads.strikinglycdn.com/files/6b4130ef-17a0-4bf6-bec6-b2f9dfedd8ae/mazupesigunesorebizaw.pdf
    • https://uploads.strikinglycdn.com/files/d2903296-085f-48ee-82e7-2a2cf40287cb/yk_yazma_teknikleri_kitap.pdf
    • https://uploads.strikinglycdn.com/files/109838bc-c3fd-43b5-a7a1-50555752d623/26538020613.pdf
    • https://s3.amazonaws.com/likerajatob/kogadareditifokog.pdf
    • https://uploads.strikinglycdn.com/files/996c5c5e-83f7-4c02-9815-53a12729750a/kagolunori.pdf
    • https://uploads.strikinglycdn.com/files/0301419f-bc95-4bf3-af53-790105093add/puzasipedunokuvewof.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4ee.bin
1761b1250bd219e3743f4e51490f9baa85afd2fbc8e36c58c6df1bde99fb9ebf
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EE 5136 bytes
font_01_sfnt_off0000d662.bin
082233deaebf9f2f51ea7f130844c30fc46c05c0c9b04b340c3a572453f2ccb1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD662 10172 bytes