Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f4f36583520730…

MALICIOUS

PDF

75.6 KB Created: 2021-03-19 04:24:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fcb5bf2152ff8241319889a92734e2ed SHA-1: be075b4d78db0c21b21be48936824be104a1dc1e SHA-256: f4f4f36583520730715cfcf1d7d5d5d6ef7cedc762e2d9abfb6e949850ade215
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 0.9996

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://jumiwimov.ru/123?utm_term=attacking+drills+soccer+pdf PDF link annotation
    • https://zopupafi.weebly.com/uploads/1/3/1/4/131454349/peliwotutogi.pdfIn PDF document text
    • https://fusewire.weebly.com/uploads/1/3/0/7/130776481/5ba8591de1.pdfIn PDF document text
    • https://rixijufufapug.weebly.com/uploads/1/3/4/4/134497528/9855728.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505771/normal_60060049acd0e.pdfIn PDF document text
    • https://pavonaxasove.weebly.com/uploads/1/3/5/3/135310158/f9f9fc5a9cb.pdfIn PDF document text
    • https://gavuzolarot.weebly.com/uploads/1/3/4/4/134458525/3727736.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370265/normal_6011a372ba36f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393016/normal_5ffb66bc47bdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467274/normal_6052dc8bcfd18.pdfIn PDF document text
    • https://zebazowis.weebly.com/uploads/1/3/4/3/134310266/toguxaxabumow-wivejiwa-busawikodof-zuzejanelum.pdfIn PDF document text
    • https://segukikiregitep.weebly.com/uploads/1/3/1/8/131856439/womovajiwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461780/normal_604f2c5776970.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bujegijuv.rf.gd/mosudugelabutizesipe.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_b0c006276c4347d597c3d7c0e91054af.pdf?index=trueIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_3326296694ea46049dd179d12beae8cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04efb281-55b8-4cf5-bcea-b23fa5053a37/el_mundo_mgico_de_terabithia_pelcula_completa.pdfIn PDF document text
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_f14c8fe27179483d8998a23051f5d00a.pdf?index=trueIn PDF document text
    • http://zenomidesedi.rf.gd/imdb_parents_guide_bourne_identity.pdfIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_1ef75e677612443eae53f8c7d9966540.pdf?index=trueIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_394f906fd92543c1bf2d54674038176f.pdf?index=trueIn PDF document text
    • http://rigetimidolofok.rf.gd/84485559718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fb32ee1-8c38-4294-adb2-99749c4cb00f/92675831812.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_off0000eb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 5376 bytes
SHA-256: 69beb0b5ad95119bd4821eb7203a821e49044e3087dfc9a70e80de3e516e1d01
font_01_sfnt_off0000fda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA4 10568 bytes
SHA-256: 02f89781dc37eeafcde6ccb3cc548699a8cdda11b9a8d684cfce0bdfcf5d7df1