Malicious PDF — malware analysis report

Static analysis result for SHA-256 18896bcb8bc7fe81…

MALICIOUS

PDF

85.4 KB Created: 2021-01-11 12:01:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0a55e94b9dd6cc098f2eed8706df6da5 SHA-1: e6af8a2090a27fae69569ba7c1136d2250701cd2 SHA-256: 18896bcb8bc7fe81b7159b249e447f8e12a9b5eb9a94008b667d3c72c52ee85b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/aws?utm_term=sign+off+document+template+project PDF link annotation
    • https://site-1177369.mozfiles.com/files/1177369/25923250656.pdfIn PDF document text
    • https://site-1176298.mozfiles.com/files/1176298/convert_to_excel_able_to_extract.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxesojogugu/jjjciiw/vumafulegeguzij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394082/normal_5ff85346920d9.pdfIn PDF document text
    • https://cdn.sqhk.co/fabukujeb/CEjdZhf/sewokejamejusenatikebux.pdfIn PDF document text
    • https://kepoxenuranejes.weebly.com/uploads/1/3/4/3/134396716/f72416e42c889d.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/4918862.pdfIn PDF document text
    • https://site-1212439.mozfiles.com/files/1212439/clumsy_ninja_games_free_download.pdfIn PDF document text
    • https://site-1166625.mozfiles.com/files/1166625/java_vm_64_bit_windows_10.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://s3.amazonaws.com/vavale/wogibisajejotima.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CF 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0000e4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 5356 bytes
SHA-256: 90f645fe5819628dc1498d8d1030439344d8809822f8ae5b6e79eb8f8c9c10cf
font_02_sfnt_off0000f6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 2744 bytes
SHA-256: dae0f12506c17deaa818396cb86411da2f7a72f10e575d6fda98e021880a3e82
font_03_sfnt_off0001026b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026B 9760 bytes
SHA-256: 7dc027b22e3aab5739dbde9395f57fc2b483bc1655faca1738d239a0af619709
font_04_sfnt_off00012407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12407 16304 bytes
SHA-256: 36298d9b42482ef505b651e9545134b76438dad7e59d1f17d96a2cc3761d4b83
font_05_sfnt_off0001397e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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