Malicious PDF — malware analysis report

Static analysis result for SHA-256 b789708af46e79e4…

MALICIOUS

PDF

82.2 KB Created: 2021-06-09 05:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e36ccb1dde0f16420c9e0bcc1e78a97a SHA-1: c40b17b55b1143edeffac0644bdbd2a1de54b1ed SHA-256: b789708af46e79e4d41ac5778074dabbb97940161b2507059a80fc07878ac6d9
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate an attempt to redirect users to potentially malicious or spam content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • 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://philabc.ru/pbw?utm_term=top+secret+silent+weapons+for+quiet+wars PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4499021/normal_5ffe6d6aebbd7.pdfIn PDF document text
    • https://movakesomerinid.weebly.com/uploads/1/3/4/5/134528648/jarolemirukejix_poxumibipifuf.pdfIn PDF document text
    • https://pafazemewo.weebly.com/uploads/1/3/4/5/134517711/6692337.pdfIn PDF document text
    • https://mejexagisogikez.weebly.com/uploads/1/3/4/4/134468566/4487910.pdfIn PDF document text
    • https://tamigitaguvaz.weebly.com/uploads/1/3/4/0/134017812/gupuzokukajosuda.pdfIn PDF document text
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/sepaterowezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_6056164653de3.pdfIn PDF document text
    • https://denalozi.weebly.com/uploads/1/3/0/7/130776502/jozamukirodu.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4470524/normal_60b463c3c3c90.pdfIn PDF document text
    • https://kawikixefi.weebly.com/uploads/1/3/5/3/135388441/6458671.pdfIn PDF document text
    • https://jigaposu.weebly.com/uploads/1/3/5/3/135397088/vawuzitejunejotepip.pdfIn PDF document text
    • https://pegupirorig.weebly.com/uploads/1/3/1/4/131406852/84c1295a26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379859/normal_5fccf7ce3ecf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421464/normal_6057e81827f3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502920/normal_600e2283beb45.pdfIn PDF document text
    • https://mixusabap.weebly.com/uploads/1/3/4/0/134096097/89036.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://uploads.strikinglycdn.com/files/05ac30ff-315e-4a5c-9fc8-f17c3de1d10c/rumofapafeledomajezobalaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5da0fab5-2a8e-4782-8a4b-8a51e3f50d54/67166987799.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/f/49234420623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f4a1cf-8559-44b5-9c2d-f57fd0b5f3d9/68550897099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9642b09d-a4d3-4917-9bb9-e4fe348b6175/telecharger_idm_avec_crack_et_patch_gratuit_pour_windows_7.pdfIn PDF document text
    • http://zufogopojut.pbworks.com/f/how_to_get_free_gems_in_archero.pdfIn PDF document text
    • http://penezilo.pbworks.com/w/file/fetch/144916245/lr_eswari_old_amman_songs.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/f/rikijodogudifegigurado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddcb3c98-a7be-463c-80b5-38c9f880d697/black_and_decker_iron_heat_up.pdfIn PDF document text
    • http://zuwofig.pbworks.com/w/file/fetch/144616143/how_to_receive_the_power_of_the_holy_spirit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 5060 bytes
SHA-256: 604844ccc53ff84afe62e8952f83d510e2e4cbc3b1e08df5bae5bf521dc1c462
font_01_sfnt_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 10584 bytes
SHA-256: d11063758397674363332f053cc010b031a7db87df19208db1f83d91df4cf4d0
font_02_sfnt_off00012d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0C 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71