Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7035487ee4fd5d5…

MALICIOUS

PDF

78.7 KB Created: 2021-04-04 14:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: dd2ab684cfdfe656235de93ff5ae8003 SHA-1: 467aa34d3214f2a5716ba1da616202b93926de87 SHA-256: c7035487ee4fd5d547a0609f3a35634f7a60e2bbf89b08699482f4e546bc4b66
186 Risk Score

Malware Insights

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

This PDF file 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, appears to reference a calendar, which is likely a lure to direct users to these malicious or spammy external sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or content-scraping tool.

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://soxebez.ru/award?keyword=cute+yearly+calendar+2020+pdf PDF link annotation
    • https://dudepemak.weebly.com/uploads/1/3/4/7/134702006/d211893c2d0.pdfIn PDF document text
    • https://tekebuzegox.weebly.com/uploads/1/3/0/8/130814382/lozeluzokofoze.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/FhjnHgc/best_racing_manager_games_android.pdfIn PDF document text
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/penuka.pdfIn PDF document text
    • https://sekilulijafos.weebly.com/uploads/1/3/1/4/131438177/6721165.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448096/normal_600669c6a1d2d.pdfIn PDF document text
    • https://gojanevalu.weebly.com/uploads/1/3/4/3/134353606/8759252.pdfIn PDF document text
    • https://rizebilawi.weebly.com/uploads/1/3/0/8/130814716/ribemujepusuku.pdfIn PDF document text
    • https://ripufimavewin.weebly.com/uploads/1/3/6/0/136099474/juwugugoli.pdfIn PDF document text
    • https://fofawuparojimi.weebly.com/uploads/1/3/1/0/131070926/fotebitose-paguzaluwugixu.pdfIn PDF document text
    • https://cdn.sqhk.co/zesozote/hhugdcJ/carx_drift_racing_pc_download_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/gitesafuwu/7jaUgbY/rearrange_pages_in_files.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422377/normal_5ff2fe60e2b28.pdfIn PDF document text
    • https://cdn.sqhk.co/wukatigubo/gOb2Pid/pelukoxudim.pdfIn PDF document text
    • https://leneguvajetuse.weebly.com/uploads/1/3/1/3/131380977/bec3faf56b056f3.pdfIn PDF document text
    • https://lijepaxo.weebly.com/uploads/1/3/5/3/135324298/pitusakujov_zukowapapuv_vofakasa.pdfIn PDF document text
    • https://fujuzelos.weebly.com/uploads/1/3/1/3/131380065/torewegivejugute.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401989/normal_5ff7f018868f7.pdfIn PDF document text
    • https://tevaxekuronexo.weebly.com/uploads/1/3/4/6/134642130/guzebuliz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489056/normal_6016cbff3257a.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/9c778dce-af08-4157-8927-f40488e7a3b2/was_anthony_ramos_in_in_the_heights_on_broadway.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bebe8b0-778a-48a3-b23b-daddca4f9aa1/2008_dodge_avenger_pcm_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d0a2280-0ad9-4084-ae57-2534aa413e28/why_isnt_my_frigidaire_dishwasher_drying.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_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 5252 bytes
SHA-256: 3113153f721051779665e47a8902a91cfb7b2318d0b58c6816a79caf6288f772
font_01_sfnt_off00010802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10802 10976 bytes
SHA-256: 90e760009328d84c0525909a1f618e18a29ba49c6a572f8d238e633ce662fa41