Malicious PDF — malware analysis report

Static analysis result for SHA-256 defb62e854b650ee…

MALICIOUS

PDF

77.4 KB Created: 2021-05-29 18:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 36bf8377d8a74af85a22a4eac46cf503 SHA-1: 989c6fb24c5d773f577aa38d0139c30052894d59 SHA-256: defb62e854b650ee285498712af27122494b78dd690337bc1040e121e640c130
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://nipisod.ru/strik?utm_term=las+pruebas+de+apolo+3+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414873/normal_5fecf3b7004e5.pdfIn PDF document text
    • https://reganumezeku.weebly.com/uploads/1/3/4/7/134749319/7770359.pdfIn PDF document text
    • https://xitodilizunew.weebly.com/uploads/1/3/4/1/134108755/tukanitotowaf-doduratogi.pdfIn PDF document text
    • https://jibeguviju.weebly.com/uploads/1/3/4/7/134723477/newiwaxagavanul.pdfIn PDF document text
    • https://disadaniti.weebly.com/uploads/1/3/4/4/134463451/1015829.pdfIn PDF document text
    • https://xevosafodom.weebly.com/uploads/1/3/4/7/134739965/7513512.pdfIn PDF document text
    • https://rojikejasixut.weebly.com/uploads/1/3/2/6/132682083/buxuwitimab_wapereza_rilokoxepaxurig_gikidugumunolu.pdfIn PDF document text
    • https://vesedosaripiwuj.weebly.com/uploads/1/3/1/6/131636692/33fe90f30.pdfIn PDF document text
    • https://kenomixu.weebly.com/uploads/1/3/0/9/130969587/rumirufizav_setofudokavix_gewidaje_bitusaz.pdfIn PDF document text
    • https://pudawiwut.weebly.com/uploads/1/3/5/3/135342926/denopusukejixafo.pdfIn PDF document text
    • https://pawasisuleti.weebly.com/uploads/1/3/4/6/134652657/2a7dd9e86db5b5.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/ralezewij_jiseragugupu_vovivevos.pdfIn PDF document text
    • https://jutoxanifi.weebly.com/uploads/1/3/5/3/135321179/lobuvor-tafaxekuru-bipiro-wizup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417140/normal_5ffc3712e162a.pdfIn PDF document text
    • https://lufosafol.weebly.com/uploads/1/3/0/7/130775677/bedomofijalon.pdfIn PDF document text
    • https://mogoxolokelitaf.weebly.com/uploads/1/3/4/6/134645696/lorewinakovibux.pdfIn PDF document text
    • https://defireser.weebly.com/uploads/1/3/4/3/134347292/topexoreked-sipezules.pdfIn PDF document text
    • https://tajamexuzoxobug.weebly.com/uploads/1/3/1/4/131410736/zukivo.pdfIn PDF document text
    • https://patapirebitogi.weebly.com/uploads/1/3/0/8/130814085/9498761.pdfIn PDF document text
    • https://wivapofeselaf.weebly.com/uploads/1/3/5/3/135317026/3879280.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484995/normal_5fc6b33978b26.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_off0000ecb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 5280 bytes
SHA-256: 0b3d367273e9657b90573062649a1c6640238165038e6209381023feeb91c312
font_01_sfnt_off0000feb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 12320 bytes
SHA-256: b5b9780ed8914f1f275e17c9805f358f40799e782221997e5e06c7cd608caa18