Malicious PDF — malware analysis report

Static analysis result for SHA-256 f915d79fab079e46…

MALICIOUS

PDF

77.3 KB Created: 2021-04-04 15:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 758799f48992ebc9406c67806eb9f696 SHA-1: d6eb1bb839c68962221c3426627228aa2f95057b SHA-256: f915d79fab079e46fcc5b709e628a751bd19adabcb41ab158ad6417666d2e328
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for distributing further payloads or phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://zajinet.ru/123?utm_term=software+converter+video+mp4+to+avi PDF link annotation
    • https://zomafada.weebly.com/uploads/1/3/4/7/134772300/mefefisiv-vijosibalori.pdfIn PDF document text
    • http://nowefewafugaki.iblogger.org/70573361001.pdfIn PDF document text
    • http://fanuvowebutil.22web.org/whatsapp_for_nokia_e71_jar.pdfIn PDF document text
    • https://zurirepazigotot.weebly.com/uploads/1/3/0/9/130969164/vaxopadu-tinaropapulojeg-nedabexolijamo.pdfIn PDF document text
    • http://piludid.22web.org/multiply_polynomials_worksheet_answers.pdfIn PDF document text
    • https://givurili.weebly.com/uploads/1/3/4/6/134605008/lifilovapinol_xuzuberegiwif.pdfIn PDF document text
    • https://jujuguzifise.weebly.com/uploads/1/3/5/2/135299578/tilaremu.pdfIn PDF document text
    • https://vuverararusug.weebly.com/uploads/1/3/4/8/134883490/nulavafisu-bejefavixoroxi-rovelipipo.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/symmetry_worksheets_for_grade_1.pdfIn PDF document text
    • https://birugenok.weebly.com/uploads/1/3/4/6/134632973/lofirarexe.pdfIn PDF document text
    • https://pibazamigudixo.weebly.com/uploads/1/3/4/0/134000525/9995d2b1.pdfIn PDF document text
    • https://gamuxexa.weebly.com/uploads/1/3/5/2/135296165/4562695.pdfIn PDF document text
    • https://muzufuwuvul.weebly.com/uploads/1/3/2/3/132302955/8032840.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_651aec6e8a9e4f06903265f375387796.pdf?index=trueIn PDF document text
    • https://36d3fe4d-ce77-4ecd-ae21-04b42370c250.filesusr.com/ugd/871c54_7ffebe4cae8d41078b6c9b438bfcf59e.pdf?index=trueIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_bcfeb0c9d9a7487e9f0d7c59559a7e69.pdf?index=trueIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_50089d786ac14c06b6c87538a2cc603d.pdf?index=trueIn PDF document text
    • http://musowafotoxipid.epizy.com/django_render_jinja2_template.pdfIn PDF document text
    • http://vozazalemul.epizy.com/55736905329.pdfIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_4410ed883baf4fe0a1bb2041dc260407.pdf?index=trueIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_2be583adf09e4f069b11768460e56b42.pdf?index=trueIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_ceae84c681ec46ab89390c3a0e888b47.pdf?index=trueIn PDF document text
    • https://574dee49-ee40-4737-ae02-340ce2b26f9d.filesusr.com/ugd/b44cf7_8b706291520a4effb1a37eb1e74c353a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 5436 bytes
SHA-256: 63b6de9b79e3c604e4f1de1b41167882d1d6b75ebb2f04c55640ff6e029783bb
font_01_sfnt_off00010161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10161 11252 bytes
SHA-256: 4bb6fa932b51dbe5d15cedeecd52d7e947959e959c81912edd1b11a921b441a1