Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b25c6a495006ad4…

MALICIOUS

PDF

73.0 KB Created: 2020-11-27 04:25:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31cd02b0c01dae252294f4406a6d4403 SHA-1: 1e25d5aac8c44ddb1794a6581442bbe4db861b9d SHA-256: 9b25c6a495006ad4d1b881a225670d3f4a3b96c86bb45a30ea217fd46435b870
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm containing numerous external URLs. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of a large number of external links suggests an attempt to redirect users to potentially malicious sites, aligning with phishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/123?utm_term=delta+sigma+theta+gold+jewelry
    • https://wejapofi.weebly.com/uploads/1/3/4/5/134590092/0dcceef131d105.pdf
    • https://cdn-cms.f-static.net/uploads/4461509/normal_5fbefee9e1a83.pdf
    • https://cdn-cms.f-static.net/uploads/4387577/normal_5fa395f684e90.pdf
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/6a802eed2366b.pdf
    • https://cdn-cms.f-static.net/uploads/4384642/normal_5fa398b7c7ef8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/043076a8-1970-448d-937c-97b704c6d8cf/sedepakigul.pdf
    • https://uploads.strikinglycdn.com/files/efeb7fe3-175c-419b-86c5-c14482bbd553/mujoforitegig.pdf
    • https://uploads.strikinglycdn.com/files/ee1d2d52-b5d8-468c-bb00-97673df13159/voridewapebepu.pdf
    • https://uploads.strikinglycdn.com/files/20af7f8a-0d41-4896-93b2-e67f82873963/2242812156.pdf
    • https://uploads.strikinglycdn.com/files/c8a41bde-2b52-4e5d-8663-379f7454f92e/batazugipekaseluder.pdf
    • https://uploads.strikinglycdn.com/files/b37dac8b-c1e2-46cd-9683-2ea468692297/furikake_chex_mix_hawaiian_electric.pdf
    • https://uploads.strikinglycdn.com/files/9d22babe-47f8-4435-9f5b-6e9849eebad7/nomemibokukapigudim.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c937.bin
8b4f60a4bbb0864eff9558137d29bc02ab850d12d9aa4d574e963c17624676fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC937 5508 bytes
font_01_sfnt_off0000dbe5.bin
7037d18f8b45078d69abdf8ee5f35140b339102de7a68f27fd0f01202b7a878f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 11068 bytes
font_02_sfnt_off0001020d.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020D 16092 bytes

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