Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f58dab44b717388…

MALICIOUS

PDF

73.0 KB Created: 2021-05-30 12:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 69016944c45df518b5953d00261b3640 SHA-1: 7fd564d82bc57ee5008dbcc7cc527f92e079c656 SHA-256: 9f58dab44b717388c9d8af25eb1626460ac9e24322e932eab0fb72e23b6829f4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The primary URL, https://soxebez.ru/strik, is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

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://soxebez.ru/strik?utm_term=how+to+pair+i-pilot+remote PDF link annotation
    • https://biruvosuvibu.weebly.com/uploads/1/3/0/7/130739381/vijexefonene.pdfIn PDF document text
    • https://reribowin.weebly.com/uploads/1/3/4/6/134643330/8568038.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465151/normal_5ffa7ca5a5658.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496013/normal_60438c4b8e6ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385634/normal_600082a320901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5fd961f3d4642.pdfIn PDF document text
    • https://gelatotagubas.weebly.com/uploads/1/3/0/8/130813077/8fd2307012.pdfIn PDF document text
    • https://nolobatunu.weebly.com/uploads/1/3/0/7/130740420/a258f.pdfIn PDF document text
    • https://xoludebule.weebly.com/uploads/1/3/4/5/134526363/puladumugu.pdfIn PDF document text
    • https://pakipuxis.weebly.com/uploads/1/3/5/3/135347710/4627336.pdfIn PDF document text
    • https://kemoborinavimes.weebly.com/uploads/1/3/4/8/134874231/xuziluzak.pdfIn PDF document text
    • https://wavopotajulaja.weebly.com/uploads/1/3/4/6/134631105/7500915.pdfIn PDF document text
    • https://dijafujuzu.weebly.com/uploads/1/3/4/3/134369935/7927964.pdfIn PDF document text
    • https://javodamujuwevef.weebly.com/uploads/1/3/4/4/134446411/2433846.pdfIn PDF document text
    • https://sekoxakukajafal.weebly.com/uploads/1/3/4/7/134705290/sosixajetul_gikifewibu_pugatesak_rigigevujugo.pdfIn PDF document text
    • https://vorexumezekadan.weebly.com/uploads/1/3/0/9/130969740/wekujigakudogogaru.pdfIn PDF document text
    • https://tozowibalap.weebly.com/uploads/1/3/4/3/134383498/tujosuzalezubawonoto.pdfIn PDF document text
    • https://pipamoximiketo.weebly.com/uploads/1/3/0/9/130969724/715156.pdfIn PDF document text
    • https://zenimuxen.weebly.com/uploads/1/3/4/3/134317926/cce18ea0c7039.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4409110/normal_60b21dfe64744.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FF 4872 bytes
SHA-256: ae2d9aeebbf6145deb6c9919e36de740acd4e4cd2777c7eabd3b092cd92392b4
font_01_sfnt_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 10624 bytes
SHA-256: 9781c8a74fd6a66da176e3b30d74bf68de15913269ee982aba54af724bf14470