Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fc1e09a845b425…

MALICIOUS

PDF

79.5 KB Created: 2021-04-08 22:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1fe374ed3c0807a3a4054dc19e73764b SHA-1: 1232eba4184a11d54d07e2deddada3de519ee5a3 SHA-256: 31fc1e09a845b4251f55890e7d5a793a73ee8dee62917b22a8b313e2caebc2ca
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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
  • 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://xezojetit.ru/strik?utm_term=data+structures+in+cpp+interview+questions PDF link annotation
    • http://gatorama.fun/376843233559fp8e.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/tyt_th-9800_softwarenc6dm.pdfIn PDF document text
    • http://immorta-cross1.club/wusowoxarifixezesun635d1.pdfIn PDF document text
    • http://center-about.com/78260588711bz1d9.pdfIn PDF document text
    • http://goldstein.capital/90814997387f5mmc.pdfIn PDF document text
    • http://leftoutclub.com/wamorojn8l2f.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/cache_memory_lecture_notes.pdfIn PDF document text
    • http://fruitslope.online/bangalore_metro_map_all_phases0hosz.pdfIn PDF document text
    • http://kudusakepupa.sportsontheweb.net/84868551351.pdfIn PDF document text
    • http://idealica-italiaoficial.site/aashto_lrfd_2017z5wob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34a21af-847d-4e5f-8e37-6cdc6b4816ff/pyramid_principle_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf81f7bf-5c34-47c9-abfc-972a0430b1b4/dance_with_dragons_show.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_602b488ff68142c780eeaa40a3586415.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd9ab6a9-681e-48cf-9bab-a77865b56cc4/zopuxepovemipukizoxuvigo.pdfIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_baf16223ec6c408bb0e503602027548b.pdf?index=trueIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_d53f623d96194c709beccca311b96bd6.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_7ab0bd124efc471cab6017a882f553b7.pdf?index=trueIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_8da44afc13754f0cace6a6404a15575a.pdf?index=trueIn PDF document text
    • http://fidegaf.atwebpages.com/how_to_connect_onn_soundbar_to_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/120c89d8-7d80-404b-99f6-67753cde7d69/kero_sun_omni_105_wick.pdfIn PDF document text
    • http://koradanizepagow.myartsonline.com/rukaledepululitogoro.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_off0000fae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE3 5172 bytes
SHA-256: fd21d66e9924b2ee0f80f7cf55660dac23cac433d6e160bb3fe5bc315d1eb9e2
font_01_sfnt_off00010cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAD 10584 bytes
SHA-256: 91499cfa0c35e06962201d725722bfe9064d940722e02e00a0d618b7f55e9c30

Open this report in the interactive analyzer, or submit your own file for analysis.