Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b70295484ce21a0…

MALICIOUS

PDF

74.5 KB Created: 2021-06-01 06:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fd73df11b41045c1de7debf4b33e80c0 SHA-1: e7d1e959d2b9e38c0644ede6487ad0ffcffe8c2c SHA-256: 2b70295484ce21a0c8875dcdfa3df5ec07b4a117be68aa397ef35c915762006f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that leverage embedded content to initiate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/pbw?utm_term=how+to+write+a+narrative+about+yourself PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471691/normal_604ae28c178a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413850/normal_600fc7be2c389.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445106/normal_5fec86190e7d0.pdfIn PDF document text
    • https://kukuwusak.weebly.com/uploads/1/3/1/3/131379738/dojuvalise.pdfIn PDF document text
    • https://sajejedazo.weebly.com/uploads/1/3/3/9/133999783/zafuvuza.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4426551/normal_60b1551b7327e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454999/normal_604fe69e8abfa.pdfIn PDF document text
    • https://mogoxolokelitaf.weebly.com/uploads/1/3/4/6/134645696/3b68a85b4e5f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443821/normal_5ff4171537f01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388052/normal_5fc9ecbbae8bc.pdfIn PDF document text
    • https://wimixexaselu.weebly.com/uploads/1/3/4/3/134324609/sobofirakupo.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/kobawudum.pdfIn PDF document text
    • https://gudugobaxav.weebly.com/uploads/1/3/4/5/134500737/2226590.pdfIn PDF document text
    • https://kifelulamexeb.weebly.com/uploads/1/3/4/3/134310841/mimukomuzaf.pdfIn PDF document text
    • https://zofiludel.weebly.com/uploads/1/3/5/3/135347527/zobutopebaporazizer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_602722cf0d032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403556/normal_606c9b0fb2d25.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dewubuk.pbworks.com/w/file/fetch/144422889/52060642698.pdfIn PDF document text
    • http://gosirata.pbworks.com/w/file/fetch/144444417/easy_wrap_dress_pattern_free.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/formalistic_approach_in_literary_criticism_ppt.pdfIn PDF document text
    • http://giresizuloki.pbworks.com/w/file/fetch/144443397/mibop.pdfIn PDF document text
    • http://jumedew.pbworks.com/f/why_does_ford_use_manual_locking_hubs.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144424557/coordinate_plane_word_problems_worksheets.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144423192/mb_to_kbps_converter.pdfIn PDF document text
    • http://xorunezagu.pbworks.com/w/file/fetch/144435813/top_5_best_live_wallpapers_for_android.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_off0000e5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CF 5116 bytes
SHA-256: 6df85daaf17b8f52e679949cbc24fd46511943be7639e77abbb84d7806ab61a2
font_01_sfnt_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 10860 bytes
SHA-256: c27de00d963d8807d227c9193c8802197b81ea1c318628cd7569ac14736bc487