Malicious PDF — malware analysis report

Static analysis result for SHA-256 9070ec7a386ec31d…

MALICIOUS

PDF

87.6 KB Created: 2021-03-23 10:45:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0357ad729b3c1a48c966c84999982953 SHA-1: b6697832d92dbadbc634abf72741805262b2feb0 SHA-256: 9070ec7a386ec31d7c7e56dc6a3baf6e02fc6857678dee5525bd47e00838834b
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. It contains a large number of embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs are the primary indicators of malicious intent, likely leading to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=aftermath+pdf+espa%25C3%25B1ol In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385876/normal_5fdb29640f653.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385421/normal_601ebf2c71324.pdfIn PDF document text
    • https://xopadubimedo.weebly.com/uploads/1/3/4/8/134858850/wunubanon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454973/normal_5ff3779fe6f6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417129/normal_6002c66c4eba6.pdfIn PDF document text
    • https://sawagifavemon.weebly.com/uploads/1/3/0/7/130775832/9a23b16814183.pdfIn PDF document text
    • http://rarebuzoxexovom.22web.org/compound_sentences_worksheet_4th_grade.pdfIn PDF document text
    • https://danigutido.weebly.com/uploads/1/3/1/1/131163693/koxotixojulopos.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
    • http://wiwazojugumume.epizy.com/32447431396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a2ffae-129d-49e7-b3c6-1879ba87f70b/xugasizisonibededivefa.pdfIn PDF document text
    • http://gorefadusajog.rf.gd/iceland_travel_guide_blog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7f6d8b2-a924-4669-9a69-290cdc409478/stealth_cam_stc-p12_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c53e5dc-0fb5-406b-90ad-0aee432f6563/kipisiwuzifexidefikikuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd93413d-3fe6-427a-ba3f-cb41061fb731/38011139388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e77326f0-92c9-42e1-8724-d138a479d527/reasons_to_be_pretty_steph_monologue_i_dont_like_your_eyes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a4db2d5-2c18-445c-b5c9-3bce1c64b975/vufidelopofuvigu.pdfIn PDF document text
    • http://tizivedimusos.epizy.com/8658856892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a09d26bf-4c6d-45e0-8f86-5c6cfc3cfa79/kovulegugufopajawizeboguz.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 3044 bytes
SHA-256: 93e1da4877c7673ced3a440955b1747bf11a35a6cbd372c16bdfaf1abd1697c3
font_01_sfnt_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 5116 bytes
SHA-256: 55bc8b10a4cfc37f3a831518c39b9770352f8532c461197823206d585780c1ee
font_02_sfnt_off00010352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10352 12388 bytes
SHA-256: c998592cfcb75a26cba11ef898b1f6b4e82f0150921a66373df7bc151334b85c
font_03_sfnt_off00012bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB8 16068 bytes
SHA-256: b87f97ee19d0eebf852dd88b0ab32469aeb165aad349e9abc0ff3cff3eb64326
font_04_sfnt_off00014056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14056 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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