Malicious PDF — malware analysis report

Static analysis result for SHA-256 313c4f1136eff919…

MALICIOUS

PDF

68.3 KB Created: 2020-11-09 18:39:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 08ca069508c0ab33669a1b8eb91967ce SHA-1: 55675462b7433fe46e1e520f31e803d045aa2b4a SHA-256: 313c4f1136eff9196ea454f9e2fe4d271b62241ed487cf8c1d62ea2d069a1406
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs suggest the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafftec.ru/aws?keyword=rabbits+and+wolves+blackened+tofu+grits PDF link annotation
    • https://vozutadisifik.weebly.com/uploads/1/3/1/4/131483249/6ea6ef826f56.pdfIn PDF document text
    • https://nubojubixuxo.weebly.com/uploads/1/3/1/4/131410311/ee41066b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447663/normal_5fa2d34d6c71a.pdfIn PDF document text
    • https://tenimevu.weebly.com/uploads/1/3/4/3/134315692/1424270.pdfIn PDF document text
    • https://tuxitusonodedin.weebly.com/uploads/1/3/0/8/130873989/bbacff07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_5fa332e0260c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370090/normal_5fa49bf8edfe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f8df72bde465.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/wokokagegegaxopefus.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://uploads.strikinglycdn.com/files/c541424a-ec80-4be5-becc-b429454f22c8/rowapiki.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/h11_high_temperature_ceramic_headlight_plug.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/2570548796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e60a9e97-be94-4fbf-98da-7b20d68c95ab/kipetu.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_off0000c00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00F 5432 bytes
SHA-256: 291083cd7eade53f1acae6265646e3e31421f98fb88a45bfcc1d93e50fe2d810
font_01_sfnt_off0000d2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B2 10660 bytes
SHA-256: 8e9fc5e4da2d30a8a48cdba2ede2058b86ad4893a9bbc27d30c1a780567287ea
font_02_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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