Malicious PDF — malware analysis report

Static analysis result for SHA-256 1109fdd1acd8f2c1…

MALICIOUS

PDF

82.9 KB Created: 2021-05-23 02:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 24b3e9db00849693a86e9715ac44051b SHA-1: 74736d18576aed3992ddf9a5c2935b30b3d9df01 SHA-256: 1109fdd1acd8f2c114c9b03e2ed6d748c0b37910eb5f902739c70df058555709
226 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. It uses a password-protected-archive lure. 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 0.9995

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://gimoguvi.ru/strik?utm_term=adobe+pdf+creator+gratis+espa%25C3%25B1ol+para+windows+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387060/normal_5fd6ca0376597.pdfIn PDF document text
    • https://piwirajaluz.weebly.com/uploads/1/3/5/3/135312697/gewuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374521/normal_5ff381851c591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_5fd3573534c19.pdfIn PDF document text
    • https://bubemufebe.weebly.com/uploads/1/3/4/4/134470009/718338d7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375504/normal_60402f37db3a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388158/normal_6008cb4173aa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_5fd1697785270.pdfIn PDF document text
    • https://mawikimame.weebly.com/uploads/1/3/4/2/134235565/3192123.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379848/normal_600522fd8ffb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411512/normal_605a6983bf164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_6041861ee28f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446026/normal_60419a7b7c192.pdfIn PDF document text
    • https://pulapiselipatux.weebly.com/uploads/1/3/1/3/131378970/2629ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477409/normal_602c0830c0b3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393353/normal_60361fe906960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_602d9b293647c.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://uploads.strikinglycdn.com/files/c25ac2d0-64fe-4c71-bdbf-1f37bda93e97/juxuzenufavuwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7c1bdbb-a045-4dcc-bdc0-920095bf8ac3/best_international_mail_forwarding_service.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/24318669568.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/sheep_brain_dissection_guide_key.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/nelebudepif.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_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 5740 bytes
SHA-256: 22a673afc2c60b86568620a9f738e646db37556f29ac9f0c4b5987ecbe4658a7
font_01_sfnt_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 11696 bytes
SHA-256: 34d3058530d4ef7499f302603d89876cd9b0b977d652436f1a6d8bad2bb0061e
font_02_sfnt_off00012d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D71 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e