Malicious PDF — malware analysis report

Static analysis result for SHA-256 0695d566861cc90f…

MALICIOUS

PDF

77.9 KB Created: 2021-03-13 19:23:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 137e77b8fb66968f92c0d689305472a9 SHA-1: 921c3a9890a1ad0d9bfff30b0f612601c4d51223 SHA-256: 0695d566861cc90f555e4854da437253c837d060f9a14b883b89cd9228990699
244 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure and a PDF link farm. The document contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV also strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=reduced+row+echelon+form+matrix+calculator In PDF document text
    • http://tejowigasinafu.getenjoyment.net/miguel_street_characters.pdfIn PDF document text
    • https://bafonalilazuxi.weebly.com/uploads/1/3/4/7/134731076/fawulamaleg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_602513451a986.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/jacsidg/5305341927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_6021f208bfd0a.pdfIn PDF document text
    • https://ditaluli.weebly.com/uploads/1/3/5/3/135325413/gelogebib.pdfIn PDF document text
    • https://kaxapajitab.weebly.com/uploads/1/3/4/8/134896246/f8cb6.pdfIn PDF document text
    • http://vopagokiniki.mypressonline.com/90310266956.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/business_management_certificate_courses_in_sri_lanka.pdfIn PDF document text
    • https://poxejiwexoji.weebly.com/uploads/1/3/4/6/134639112/gunurudalidopazal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388052/normal_6008fc52dfc74.pdfIn PDF document text
    • https://tupivoxutod.weebly.com/uploads/1/3/4/4/134467409/bowafedij.pdfIn PDF document text
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/wifufonorut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465142/normal_5fe54b248319f.pdfIn PDF document text
    • https://vogovolakufa.weebly.com/uploads/1/3/4/8/134874318/sikexepemo.pdfIn PDF document text
    • http://kigaruzolalo.mypressonline.com/rovefanerolarobej.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/17021642686.pdfIn PDF document text
    • https://fupefodomixeja.weebly.com/uploads/1/3/4/8/134889506/wexutitiralib-govog.pdfIn PDF document text
    • https://mivuwapirodi.weebly.com/uploads/1/3/2/6/132681474/3320332.pdfIn PDF document text
    • https://mudulavodeg.weebly.com/uploads/1/3/1/0/131070753/55a251.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495039/normal_5fe34593a1d77.pdfIn PDF document text
    • https://cdn.sqhk.co/vadezewe/idyhaQv/31269460611.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rukosivujuxu.atwebpages.com/the_book_of_secrets_full_movie.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_off0000ee0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0E 5252 bytes
SHA-256: b37af2ca94c6d1b4da4ca754ff6d809f19fd684a2e66f81865fb3e55d3bfb15d
font_01_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 11892 bytes
SHA-256: b9c8251bf28a46f1e813635142a4b63ea2b9dba28a27fd257bdfc53ae52bc711