Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57f0348bddc0a31…

MALICIOUS

PDF

75.2 KB Created: 2021-02-15 09:06:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9ccc6bcf2b4f131f6258b4b2089e0e1b SHA-1: d192000f1b08e2be3bb844042bc5690cc0768f8a SHA-256: e57f0348bddc0a310297e6500157904ad819a04923311f4971dd74e635c749c5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as a link farm, containing a large number of external links to various domains. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document's purpose appears to be directing users to a wide array of websites, likely for SEO manipulation or to host phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=pier+one+chairs+leather PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382790/normal_5feea7767d8ab.pdfIn PDF document text
    • https://cdn.sqhk.co/nezerozara/LgdDjcJ/15147596603.pdfIn PDF document text
    • https://wuginimujewege.weebly.com/uploads/1/3/4/7/134714977/150544.pdfIn PDF document text
    • https://wilibupa.weebly.com/uploads/1/3/2/6/132681560/7531099.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377642/normal_5fd66bcb4b6b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371508/normal_60115dffed514.pdfIn PDF document text
    • https://renevemepo.weebly.com/uploads/1/3/1/6/131606397/jarenomotim.pdfIn PDF document text
    • https://kixofugowewo.weebly.com/uploads/1/3/1/8/131872146/podegixigawok_kipenizuwalirax_vapiwemede.pdfIn PDF document text
    • https://mowerezudajam.weebly.com/uploads/1/3/5/9/135966589/vadim-mufajidowiga.pdfIn PDF document text
    • https://noxerurivago.weebly.com/uploads/1/3/4/7/134767941/tepadexuzifider-finukomigukiw.pdfIn PDF document text
    • https://nebelifufenav.weebly.com/uploads/1/3/1/4/131437331/3126603.pdfIn PDF document text
    • https://memabalizova.weebly.com/uploads/1/3/4/4/134490842/9e69264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385197/normal_602a0a341fca7.pdfIn PDF document text
    • https://kunoloxudiruk.weebly.com/uploads/1/3/4/7/134767428/bukunew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/81739046555.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/fereverefubal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 4676 bytes
SHA-256: b4e0b032c13e41f1221ef30ad96719a8968064f35474fd1a8373f1a395723345
font_01_sfnt_off0000ed4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4A 10584 bytes
SHA-256: 4cae00cc281913fc331dae200bb8b7685737c3c6c51038a51851d1aadb9fe671
font_02_sfnt_off0001114d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114D 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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