Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1cd08cf73876add…

MALICIOUS

PDF

69.2 KB Created: 2020-11-14 09:41:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d8cc338eafd605f3b6e91d820ec5e253 SHA-1: dc978961c2352a238e78705804df036cb85c291f SHA-256: f1cd08cf73876add9930ff01c9f64ec67e5617fc5e129e091fa794ff8d5aa85c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/strik?utm_term=geometry+dash+2.1+mod+apk+free+download PDF link annotation
    • https://xororowikaluna.weebly.com/uploads/1/3/4/6/134643421/5715356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_5f89d217d2b3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472764/normal_5fa52aa5016fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_5f8c8faf37daf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470980/normal_5faae442be526.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/sesififajarir_kiwujoxesuno.pdfIn PDF document text
    • https://jimazakogise.weebly.com/uploads/1/3/4/6/134612968/2179325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384304/normal_5f8f29912e00c.pdfIn PDF document text
    • https://xamegazu.weebly.com/uploads/1/3/4/4/134440804/pevelewesabixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410186/normal_5f9f8898225bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f8d7fe3e5433.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://s3.amazonaws.com/boxujetanonikuv/kenurorezujatetakileliwim.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/pokemon_tcg_online_apk_2.66.1.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/4274235056.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_off0000c3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BE 5528 bytes
SHA-256: 34525dbf59ee2b30969313a7ca7b4a3e09f59ea51d4a98f81c50dd736caf5adb
font_01_sfnt_off0000d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 10268 bytes
SHA-256: 188410e64f507edaf47dd75c7975d323373cac2d244c42e7e06680670bf08ab3
font_02_sfnt_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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