Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a42df17b582769…

MALICIOUS

PDF

79.9 KB Created: 2021-06-02 09:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5f25f13b0700a409b3f18b51f3bb96df SHA-1: ce1ca6ffd3793670496e2c2a5377f37659954dde SHA-256: 76a42df17b582769752de660764a4df81e4c334317c5ff8f50ecc555a125c345
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cructi.ru/pbw?utm_term=medical+collection+agency+florida PDF link annotation
    • https://jovapotokuxeb.weebly.com/uploads/1/3/4/8/134881142/349619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447085/normal_606503a6f30a5.pdfIn PDF document text
    • https://febamepu.weebly.com/uploads/1/3/1/0/131070604/ramovizozipu-dagenojajik.pdfIn PDF document text
    • https://nobibiraxofos.weebly.com/uploads/1/3/4/9/134904538/zumefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450003/normal_6057cc0b7d624.pdfIn PDF document text
    • https://bowefolezoz.weebly.com/uploads/1/3/1/4/131407704/4356460.pdfIn PDF document text
    • https://zaxanedipujez.weebly.com/uploads/1/3/4/5/134582154/cfb7523bdb33b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408170/normal_5fdc1a0657f5d.pdfIn PDF document text
    • https://dovenegipejapu.weebly.com/uploads/1/3/0/7/130740438/1319261.pdfIn PDF document text
    • https://tifunubuxeji.weebly.com/uploads/1/3/4/5/134523212/sixak_soviwodezeda_todupaleduvo.pdfIn PDF document text
    • https://jobufuxaxaxugo.weebly.com/uploads/1/3/4/8/134854920/pavekoz_rurasebigosex_zurolubaz_pajadaxuj.pdfIn PDF document text
    • https://manesufepal.weebly.com/uploads/1/3/1/3/131381078/manod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453134/normal_5ff56e20f2621.pdfIn PDF document text
    • https://birafuwufejutik.weebly.com/uploads/1/3/4/5/134598964/1123290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467322/normal_5fdc025cccd34.pdfIn PDF document text
    • https://febafowizozijuz.weebly.com/uploads/1/3/4/8/134860945/mobodosak-togeziro-tagapolesibapod-nazop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144427371/abecedario_con_imgenes_para_imprimir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a61c330b-d039-44c6-8a78-85e097939812/jeluwevagubed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03713c37-27fb-4fd1-bcdd-20a41618d5a2/how_to_find_gateway_and_subnet_mask.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc097a17-0546-49b5-8160-202a8a5ff20e/how_to_get_into_bios_in_lenovo_g50-80.pdfIn PDF document text
    • http://lulimogosan.pbworks.com/w/file/fetch/144492501/razubelelovalijemaxifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c8ab7f-0648-4411-b452-01cf253356cd/how_to_flush_a_rinnai_tankless_water_heater.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144487668/toefl_itp_level_1_practice_tests_volume_1_free_download.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_off0000fb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7F 5120 bytes
SHA-256: 748f5e619373d635cbcb02f14189045e56a854034c17ade9b6ab6a0d46a76412
font_01_sfnt_off00010d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0F 10996 bytes
SHA-256: c385b9f8fef19c9ca31d5db50339252c5b42c980b37accfefba7fa099b064317