Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c399c973a13a338…

MALICIOUS

PDF

68.3 KB Created: 2020-11-23 22:12:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 076c607c6c842685073959d16e41ce4f SHA-1: 1c7fae479a60cccb9a585ab94ed01769343796b2 SHA-256: 2c399c973a13a338351240cd57d87ce41d6fb99b12aa7c0bb9901d09f428d892
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a game guide, likely to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/123?utm_term=osrs+demonic+gorilla+guide+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4484122/normal_5fb6cc1c554a6.pdfIn PDF document text
    • https://lujogisuz.weebly.com/uploads/1/3/4/9/134904514/7062608.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/4715cc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464077/normal_5fb3d30fe6d80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_5fa933d188b92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403421/normal_5f97c8ea7cc02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386613/normal_5f91e615e5fbd.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/ginutu/muduxuxabovowowi.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/49833392794.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/lapolabokitofagelixepeb.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/binomische_formeln_umgekehrter_richtung_anwenden.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/64754003706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdf2fd01-9be6-4460-a348-dbf256a68a1f/the_sims_3_android_apk_offline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/411ed3a4-1852-4b6f-85b3-b0eb38150f91/vexatokumowisuwotifigoz.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_off0000ccbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBD 5560 bytes
SHA-256: cd86ab8317386c319730e54b2dda02cfca5799614cba237f51f1e0fe9c4a2242
font_01_sfnt_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 10860 bytes
SHA-256: 55d48682041cc04b6d28435cb93ca21c4b5e255024e18d9a0fbb884d3403be20

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