Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec1c0e6245f802a…

MALICIOUS

PDF

77.4 KB Created: 2021-05-30 07:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4378290e37904001401e3a3a7a145061 SHA-1: 16a31fe0d0fa205557f1afcc5b456ad2ca7ca020 SHA-256: 7ec1c0e6245f802ac26ab36aa2dfa6b9b125c396a412f8fd38995cd3106cbb74
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by both ML classification and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains text related to 'proof of concept agreement' and references the wkhtmltopdf tool, indicating a potential lure for users to click through to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=what+is+a+proof+of+concept+agreement PDF link annotation
    • https://zuxolizaf.weebly.com/uploads/1/3/2/7/132740519/8441583.pdfIn PDF document text
    • https://zimuroxojirewun.weebly.com/uploads/1/3/1/4/131407818/tujinawafasa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373983/normal_5ff17d5e9cb7d.pdfIn PDF document text
    • https://valuluxunu.weebly.com/uploads/1/3/2/7/132710491/1383326.pdfIn PDF document text
    • https://tipuxefisabe.weebly.com/uploads/1/3/4/8/134846761/5665276.pdfIn PDF document text
    • https://poniparo.weebly.com/uploads/1/3/4/6/134610273/6157539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_6020bc05df1ca.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/ligiwesuveso_fobiworefukawex_wevuzalug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474719/normal_5ffe3100f34e5.pdfIn PDF document text
    • https://duxizesojisuvab.weebly.com/uploads/1/3/5/3/135327590/pesesakolotibux_kolaxaz_xozoraxomepuve_jotulir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454161/normal_6021a4babb479.pdfIn PDF document text
    • https://wokewimafagi.weebly.com/uploads/1/3/4/5/134598023/bebowiranob-mabowe-rorivesiwazi-gobon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453906/normal_60663ad864fe5.pdfIn PDF document text
    • https://taxusuxegob.weebly.com/uploads/1/3/3/9/133997122/buvaxavid-liforosejuraxom-zabagevulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_603ba2f66d133.pdfIn PDF document text
    • https://zegexexu.weebly.com/uploads/1/3/4/3/134385137/pidudu_wususi_mobumajar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/787203d9-a9f5-4c8f-ba46-5260212ff090/kefopejeturubositewapapus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3859d32f-3f63-4427-baee-23c47c76aac3/microelectronic_circuits_by_sedra_smith_7th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c661600e-8b0e-4e9f-b894-600dffb27e93/firotesuzugobetabuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5436f8c6-eaae-45cd-8c39-ae4917eacd63/how_to_clean_printheads_hp_photosmart_c4780.pdfIn PDF document text
    • https://bit.ly/2C3CFe2In 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_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 5408 bytes
SHA-256: 0c1868641eda351112d446e65bbd19ea38e1f6586ed4ddebd6733688a9609161
font_01_sfnt_off000103ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EF 10636 bytes
SHA-256: 147044816f0a5c29754f8225bf56ee76ba7181ecd1000a91b50451bd1ccbc1b8