Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e1f056c1976877…

MALICIOUS

PDF

69.5 KB Created: 2021-02-20 04:48:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e44556fe05b1caa0a0af6102820de0bf SHA-1: 247e766047ce763e46f5eca9f19c530757762f93 SHA-256: 87e1f056c197687735d86b0ae96da86f776b201ad2be1fa814fe987b9b97b8c1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and the link farm nature of the document point towards an attempt to lure users to malicious sites.

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
  • 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://leonvi.ru/123?utm_term=organizational+behavior+book+pdf PDF link annotation
    • http://zarabotok.space/92689196438ytftu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490376/normal_5fefecc6c697b.pdfIn PDF document text
    • http://lakulikelanu.iblogger.org/15712497585.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407983/normal_5fda39e8cb4bf.pdfIn PDF document text
    • http://rat-red.space/betty_en_ny_episodes64i27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_5fd85c338139c.pdfIn PDF document text
    • http://stalekost.site/autocad_map_3d_2018_tutorialiepm3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476751/normal_5ff525dd37768.pdfIn PDF document text
    • http://pipopituga.22web.org/kiguxobuwixufifiwu.pdfIn PDF document text
    • http://dronextactical.xyz/publix_wedding_cakes_reviewsk93fy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484639/normal_5fc85f4c01730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530990/normal_600fc7a6e90d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473892/normal_602430faa15b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472221/normal_5ff2bade77b40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403960/normal_5fdbb790685a8.pdfIn PDF document text
    • http://bupetud.xyz/kijamasuv7bju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zufomemibuji.rf.gd/tukoxikisolowebed.pdfIn PDF document text
    • http://lukoleni.epizy.com/awdhesh_premi_gana_bhojpuri_video_hd.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_off0000d3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D2 5468 bytes
SHA-256: 5d3f4fc870915bd10d2023965163d65d4a4f61f9bf842505d40ae102905532f5
font_01_sfnt_off0000e66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 10032 bytes
SHA-256: c78929491ed392b5d2ac8b890b895f50e2c5b734ba097b6e47eb5d5f7230f6d5

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