Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65f1e5d85b3b9bf…

MALICIOUS

PDF

79.5 KB Created: 2021-04-26 16:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f359de008b000244fac3f53f9c7e7689 SHA-1: 29685066622df74d5d817dddee889b7ff227a167 SHA-256: d65f1e5d85b3b9bfec8dbcd1e0efd8ccc0f1f3579b72e4f7100ece10dcad4a50
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 pointing to disposable hosting, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to architecture, likely serving as a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://fokemale.ru/strik?utm_term=genius+loci+towards+a+phenomenology+of+architecture+espa%25C3%25B1ol PDF link annotation
    • https://nogekapufininut.weebly.com/uploads/1/3/3/9/133997605/cf1721248c02dbd.pdfIn PDF document text
    • http://towudarefu.22web.org/dasivisefif.pdfIn PDF document text
    • http://bukenisefino.mygamesonline.org/35509202440.pdfIn PDF document text
    • https://zipixaxunisegon.weebly.com/uploads/1/3/4/6/134625234/fd2b3b.pdfIn PDF document text
    • http://pebifakonek.sportsontheweb.net/aluminothermic_process.pdfIn PDF document text
    • http://nosinoski.shop/20199438210lwk17.pdfIn PDF document text
    • https://divamokavagi.weebly.com/uploads/1/3/4/8/134871471/7956604.pdfIn PDF document text
    • http://pestore.pro/2002_honda_civic_ex_repair_manualau7nm.pdfIn PDF document text
    • https://furimulu.weebly.com/uploads/1/3/1/4/131411024/b3c7289.pdfIn PDF document text
    • https://tapojanez.weebly.com/uploads/1/3/1/3/131398133/3811f86.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://69f1164a-dcd3-4310-9fb4-3b67f03bdbb0.filesusr.com/ugd/9d7282_b8e39cc321d64e67b0fdf58177560fd7.pdf?index=trueIn PDF document text
    • https://c9977776-9e37-4432-9eae-e541147807da.filesusr.com/ugd/bb6cc6_472abad0e22b433389c74bab83f50d11.pdf?index=trueIn PDF document text
    • https://ac911ccd-a574-46a9-bbb3-57bb927ff796.filesusr.com/ugd/2735c9_9b763aea15f04616af356725d581b04d.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_be9006dd4cbf42eaa1f7d712b51cdb5f.pdf?index=trueIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_9edc63fef6f74bf8942c7f428b8520e5.pdf?index=trueIn PDF document text
    • https://1dfef493-bba3-4db0-89f7-7cef958ceea2.filesusr.com/ugd/3dbeb3_cdb9c174e30a4e8d8c1a4cbddc4e4d77.pdf?index=trueIn PDF document text
    • http://bupikizatigog.rf.gd/base64_encode_file_python.pdfIn PDF document text
    • http://benamow.myartsonline.com/vobonozumolezi.pdfIn PDF document text
    • http://rekutuvogunavur.rf.gd/anthony_giddens_sociologia.pdfIn PDF document text
    • https://6c639bf1-704a-4500-b661-329758898742.filesusr.com/ugd/02d620_5564e5a6aa70467aab985967f6fd425a.pdf?index=trueIn PDF document text
    • http://fegoluvarelewum.myartsonline.com/comitia_centuriata.pdfIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_32688e87093143e9b630ef3aa0cad659.pdf?index=trueIn 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_off0000e677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE677 5888 bytes
SHA-256: 4ca53b84f87d35e3021147ac793829ed46d2e2b4ee64a3f453d9729c7746c5dd
font_01_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 11060 bytes
SHA-256: c9775797d43f5354d1f53c7c84004651644d0bdce80220e619f2127c0e835d95
font_02_sfnt_off00011f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e