Malicious PDF — malware analysis report

Static analysis result for SHA-256 93fe9bac7eb7252c…

MALICIOUS

PDF

187.3 KB Created: 2021-03-28 00:54:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c4f57bc86a82ac2ccffa6bfb3e97a506 SHA-1: a8571f8f3823899850babbf253f05564a8c8d20d SHA-256: 93fe9bac7eb7252c8cc62318936e3ea53c2647d9124eb33239f935aab5acce41
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirector infrastructure, designed to lead users to malicious content. Heuristics indicate the PDF is a link farm and specifically flags a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly support a malicious classification. The document body, though heavily obfuscated, contains text related to search queries, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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 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://crophysi.ru/strik?utm_term=is+stephen+hawking+dead In PDF document text
    • https://lajogaful.weebly.com/uploads/1/3/4/4/134481829/6084c60ae.pdfIn PDF document text
    • https://lexugorubu.weebly.com/uploads/1/3/0/7/130776619/lolefe.pdfIn PDF document text
    • https://cdn.sqhk.co/razotefo/KjfnghJ/bilesej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417032/normal_600050dce31e8.pdfIn PDF document text
    • http://ruxenawuxovogu.getenjoyment.net/85811517135.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CqLhfN7/localizar_mi_android_por_gps.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/MP9Cygj/jesobiga.pdfIn PDF document text
    • http://jesibijifinuz.mywebcommunity.org/96913904524.pdfIn PDF document text
    • https://cdn.sqhk.co/baxewoxevum/eSgdhg7/74777197961.pdfIn PDF document text
    • https://mabulibatelirip.weebly.com/uploads/1/3/4/5/134597637/lulidubun.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/beginning_python_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374199/normal_602be7adb8dc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370540/normal_6008e4a457622.pdfIn PDF document text
    • http://tunabamilusi.mypressonline.com/nivumaziw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380674/normal_600fc92b08db9.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/pezajipevujefe.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/gfihwtZ/mirror_lake_state_park_map.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476288/normal_5fdb7004b6fd8.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/rokebasi.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/1956903762.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/introduction_to_modern_cryptography_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/cnc_programming_handbook_1.0.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/kozexitex.pdfIn PDF document text
    • http://duxepivol.myartsonline.com/2013_honda_civic_1.8_oil_life_reset.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00028d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28D4D 5188 bytes
SHA-256: 2b804abed9b7b3d9824e3f63751c0b1525f74d9295a59a629342a42e18b5b0ae
font_01_sfnt_off00029f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29F09 12612 bytes
SHA-256: 28c1aba9c84fd16d77a45a50e557bdeeab46175c74acc85127868b78133810e7
font_02_sfnt_off0002c9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C9B0 16140 bytes
SHA-256: b56126cbe92a8a7d2e04446278dcfacbea9a4b29ae48a91a9e361d9b7ad1feb7