Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ffedd60386995c…

MALICIOUS

PDF

81.5 KB Created: 2021-04-07 16:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 04800f777731539769ba43c685e469a8 SHA-1: 934daf68e1324cad18b86f0ce5e71bd48ecc0b35 SHA-256: 41ffedd60386995cff5e5b174d02db1587c25f31af86a22b65cf15cdf6fef4fa
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to leverage web content for malicious purposes.

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
  • 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://gimoguvi.ru/wix?keyword=look+up+walmart+receipt+online PDF link annotation
    • http://fubikopelemom.mypressonline.com/73312339333.pdfIn PDF document text
    • http://tehnotop.site/bein_sports_live_match_ipl_2020c8qf8.pdfIn PDF document text
    • https://tizupimarijifik.weebly.com/uploads/1/3/1/6/131606002/zufopopu.pdfIn PDF document text
    • https://kunobozawi.weebly.com/uploads/1/3/1/4/131453145/nuxapu_pavuki.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/alan_greenspan_book.pdfIn PDF document text
    • http://immortal-sho.club/winijizobenemebudowexu68ppb.pdfIn PDF document text
    • https://xotogifove.weebly.com/uploads/1/3/1/4/131406695/891840.pdfIn PDF document text
    • http://fumizudo.sportsontheweb.net/past_perfect_active_and_passive_exercises.pdfIn PDF document text
    • http://lugodapamaj.mygamesonline.org/mogigidalijuw.pdfIn PDF document text
    • https://wenuzivubog.weebly.com/uploads/1/3/5/3/135392435/5061842.pdfIn PDF document text
    • https://sukopowe.weebly.com/uploads/1/3/4/4/134499194/gukiwikonetar.pdfIn PDF document text
    • http://wide-mean.top/alphatrak_2_test_strips_couponsxw5a.pdfIn PDF document text
    • http://cyberlife.store/xotojonosujovpsiuc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xirexadugimog.atwebpages.com/99848644204.pdfIn PDF document text
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_cd3fb2e6f1154eeca033e790d188fa83.pdf?index=trueIn PDF document text
    • http://nopugorib.onlinewebshop.net/antibioticos_derivados_de_la_penicilina.pdfIn PDF document text
    • http://relivoziz.atwebpages.com/edit_files_free_software.pdfIn PDF document text
    • https://6090ae5c-070c-4b50-bfd2-11a66789f099.filesusr.com/ugd/83cce3_999c18cd2e304e82a6c25773fe17ee9d.pdf?index=trueIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_ba49280d1ff84d1ea3ea2ec027e156de.pdf?index=trueIn PDF document text
    • http://padusij.onlinewebshop.net/fiwojejibunawexas.pdfIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_046a808eca1a4e7dbee9d0632564f521.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6d49504-1f84-4ef7-bc1e-086a5281188c/sadlier_vocabulary_workshop_level_e_answers_unit_14.pdfIn PDF document text
    • https://74a5c9af-61bb-4d76-9351-4d02c0bf652a.filesusr.com/ugd/e33828_201763e7d70e4034a0092e8d0450f81b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6db15196-78fe-4a18-bfc4-6359ebc11e45/89620147936.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_off0000fff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF0 5000 bytes
SHA-256: 79c8710b2d241989a4e928ccc3c1feb731c6e9a8aa61f436f212e2538ed56374
font_01_sfnt_off000110f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F6 11192 bytes
SHA-256: 0e14a8d67245f1402c44b2a2b4fe0f5ba31e8a70a5958ba479f00435736534f1