Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b944ffb69b8c34b…

MALICIOUS

PDF

72.6 KB Created: 2021-06-05 00:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9cffc9f6beac42d95755658e4c63dccc SHA-1: 46a5217aa1e901da7d1d5a38ed1705ec9736d9d1 SHA-256: 9b944ffb69b8c34bf5488f64950e38bf58c78cf206e3fd11683c46d22220092c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous external URLs pointing to other PDF documents, suggesting a potential distribution or SEO manipulation scheme. The presence of external links and the overall structure strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/pbw?utm_term=how+much+rupees+stamp+paper+for+rental+agreement PDF link annotation
    • https://ragumavul.weebly.com/uploads/1/3/1/4/131483371/mokonojegub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401691/normal_606a980f413f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_6066144d13809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386837/normal_60357aa6a0c55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487187/normal_605c1dfe24d4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381090/normal_5fd9c049b988c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393776/normal_5ff548e2ac031.pdfIn PDF document text
    • https://jofenunamupil.weebly.com/uploads/1/3/4/3/134343358/bagefapamu.pdfIn PDF document text
    • https://zetidepip.weebly.com/uploads/1/3/4/4/134432407/a74ceab98dfac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368951/normal_60432ebe152fd.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/zidupuso_pufatuxebudani_misifo.pdfIn PDF document text
    • https://dopitusorotid.weebly.com/uploads/1/3/0/7/130738794/bejujedesupuge.pdfIn PDF document text
    • https://xoredanixeg.weebly.com/uploads/1/3/0/8/130814516/582b39f742e87.pdfIn PDF document text
    • https://dudixugodibemuf.weebly.com/uploads/1/3/1/4/131406925/tutenovugogoxaba.pdfIn PDF document text
    • https://fupomojokom.weebly.com/uploads/1/3/4/4/134458651/xeferodazifoduzoseg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456712/normal_5ff85a8c45c30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuvovazuvezo.pbworks.com/f/total_annihilation_kingdoms_download_free.pdfIn PDF document text
    • http://funesut.pbworks.com/f/how_to_make_a_paper_bird_step_by_step.pdfIn PDF document text
    • http://jebodigezev.pbworks.com/w/file/fetch/144524331/65954686031.pdfIn PDF document text
    • http://vafakana.pbworks.com/f/pelicula_completa_de_vicente_fernandes_por_tu_maldito_amor.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/w/file/fetch/144565761/how_do_i_reset_my_dikang_infrared_thermometer.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/w/file/fetch/144413721/majaguvusobobaxuxu.pdfIn PDF document text
    • http://momoruxoxim.pbworks.com/f/zejivujexejuvidarewed.pdfIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/144427377/navupefabi.pdfIn PDF document text
    • http://bukafag.pbworks.com/w/file/fetch/144564945/spanish_language_course_books.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_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 5480 bytes
SHA-256: 2c0b8b3b77159c8a21c0d0e967f65d9b92c5e7f6ba2cf9a7740dd5de791f878b
font_01_sfnt_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 10436 bytes
SHA-256: febaf18351ef9fd595abdb803261d263be873c34321e047e3e4bdc6320150aaa