Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03cbdfec1c20c15…

MALICIOUS

PDF

74.8 KB Created: 2021-03-22 01:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d0ca5ea40ca2234e94bab3cf49018482 SHA-1: 13978778d54c63d4854a360e3ee03a6ddb97874a SHA-256: a03cbdfec1c20c15721275918817473f53ff8ebd643fb48723556f4cd7a3ccf0
186 Risk Score

Malware Insights

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

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 0.9991

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://midufefew.ru/strik?utm_term=are+rayovac+good+batteries PDF link annotation
    • http://vopugixeroramox.medianewsonline.com/somupuvonusukikif.pdfIn PDF document text
    • http://tikanaw.mypressonline.com/nunifewele.pdfIn PDF document text
    • https://cdn.sqhk.co/lojenozasila/hfqv8gg/golf_clash_club_accuracy_wind_chart.pdfIn PDF document text
    • http://finuxezanasa.mygamesonline.org/39049331764.pdfIn PDF document text
    • https://cdn.sqhk.co/wavagowew/b7Vjfij/94277425659.pdfIn PDF document text
    • https://cdn.sqhk.co/ketegobuto/eictibR/30793151885.pdfIn PDF document text
    • https://cdn.sqhk.co/zinazejoras/oggjcBT/47713114210.pdfIn PDF document text
    • https://cdn.sqhk.co/xoguvamev/vhjZhbf/freemake_video_converter_free_with_crack.pdfIn PDF document text
    • https://cdn.sqhk.co/fofesali/jerhgjc/crazy_planets_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/eLZFTC6/dr_driving_2_game_download_old_version.pdfIn PDF document text
    • https://cdn.sqhk.co/dizukenepu/diijeja/69486604248.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/92235964946.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6754c94d-8795-460a-880d-d127bb37d4d4.filesusr.com/ugd/2383dc_ddc2b83d975648d98d4f15af094bf708.pdf?index=trueIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_edd797f3142c4be5ae01cc921b92efb9.pdf?index=trueIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_8b3db56c453b436e8676f4deb684be23.pdf?index=trueIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_794238c9b1984fb5982598ff3ebb8eaf.pdf?index=trueIn PDF document text
    • http://farovosodiwes.atwebpages.com/sirodolukisakulo.pdfIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_e89247d689754abea173583f212ba815.pdf?index=trueIn PDF document text
    • https://1794ee33-230d-455b-98b1-84d48067edce.filesusr.com/ugd/551769_0346d12c7c7f422f9663042e80bf5777.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/caldera_forms_civicrm.pdfIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_0de7b25b4d1e4a2891629a507fa8d549.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liwara/sasexolubato.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/69586069203.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/folipisexufosa.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_off0000e4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AD 5364 bytes
SHA-256: fab8ba90e1b82e523f052e026b51c7ce37ba73585ba6c0932b1b1f4c0d70764a
font_01_sfnt_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 11388 bytes
SHA-256: c075123f7ff889cfebea3d86638240cc4255b987f0501d5322abcabef1fe5259