Malicious PDF — malware analysis report

Static analysis result for SHA-256 b780aa439e85bdf9…

MALICIOUS

PDF

77.2 KB Created: 2021-05-21 02:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3f92d60d6d417972fe399a29f7d5204a SHA-1: 7a2d9ef85903035985e756377772b9c5ac90beba SHA-256: b780aa439e85bdf9778b3e1e905caeab306862e53658a56f346676fb4ff92187
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services and are designed to redirect users to potentially malicious sites. The embedded URL `https://druttle.ru/strik?utm_term=adobe+photoshop+cs6+free+download+for+pc` suggests a lure for downloading software, which is a common phishing tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=adobe+photoshop+cs6+free+download+for+pc PDF link annotation
    • https://rugexivik.weebly.com/uploads/1/3/1/0/131070765/norepen_josevefejadup_kugijo_dowuvufe.pdfIn PDF document text
    • https://warogowi.weebly.com/uploads/1/3/1/6/131606132/jukubo_medepuvez_wepagoxulini_wisebe.pdfIn PDF document text
    • https://xakijugikirire.weebly.com/uploads/1/3/1/4/131437514/wupebezudunof_gusujajikamu_donakakofam_zepofisoweze.pdfIn PDF document text
    • https://tunupufimudodo.weebly.com/uploads/1/3/4/3/134324073/mizetuzip.pdfIn PDF document text
    • https://pebiname.weebly.com/uploads/1/3/1/4/131453048/9b67149739370cf.pdfIn PDF document text
    • https://kovexinuzik.weebly.com/uploads/1/3/0/8/130815277/lepijuxalaru.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/gitike.pdfIn PDF document text
    • https://pudawiwut.weebly.com/uploads/1/3/5/3/135342926/0b7d244f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445726/normal_5fc9461bb231c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489441/normal_6057ee92c923d.pdfIn PDF document text
    • https://vebazefi.weebly.com/uploads/1/3/4/0/134040586/55428.pdfIn PDF document text
    • https://daradila.weebly.com/uploads/1/3/1/4/131438164/wupadejepenazinom.pdfIn PDF document text
    • https://niwarixetawozav.weebly.com/uploads/1/3/4/1/134108921/wewakajivodep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390071/normal_5fc5c53da5f4b.pdfIn PDF document text
    • https://puvomowaja.weebly.com/uploads/1/3/4/3/134318832/3550228.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/bezutu/prime_math_diagnostic_assessment.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/among_vs_amongst_chicago_manual_style.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71b7cd9d-4872-4d08-922f-edcbe09bdb73/mokegejuzuku.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/calendar_templates_html_css.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bd7d32d-08dd-4c58-84a3-6d43f0c6f5a4/how_to_stretch_a_karate_belt_on_your_child.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df4b1ec5-1e97-4873-84c3-5d1bdeae8f42/74693467906.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_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 5620 bytes
SHA-256: 0f6a701ae1945fb84ad855c5e29c9dd9d8a676334ada876bbe333cf61c7bc7bd
font_01_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 10116 bytes
SHA-256: b09edd104d33cd7fac439c3e67bebde893436226763440b9394c609dc7272766