Malicious PDF — malware analysis report

Static analysis result for SHA-256 05dce58ba42b5de2…

MALICIOUS

PDF

69.8 KB Created: 2020-12-15 01:32:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 713dc880cac2fd8d2861aba4b393d6f0 SHA-1: dcb42856fc7786d32b8106572aca66ee3dc74337 SHA-256: 05dce58ba42b5de2c3a467fe29626c3646d00bb937d392bd95e17441662897b9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'Nyu early decision 2020' and application metadata, likely as a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/123?utm_term=nyu+early+decision+2020 PDF link annotation
    • https://xotuwajugi.weebly.com/uploads/1/3/4/3/134349857/1855918.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/319c4bd274986.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/vevimi-zamijepuxikuzab.pdfIn PDF document text
    • https://rixidagetowema.weebly.com/uploads/1/3/4/6/134612143/b2900a57e2.pdfIn PDF document text
    • https://gurigibafex.weebly.com/uploads/1/3/0/7/130739571/kujilolorakuw.pdfIn PDF document text
    • https://sikegupul.weebly.com/uploads/1/3/4/6/134681682/881d7dee2d.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/dowavelaxam/tubupapusovutonure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d7676e9-ccfc-4077-b293-86ad9e95a70d/86775220118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6c1b24a-627f-4e79-9ac4-56ae42132f60/10_second_ninja_trophy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be3856af-d344-46ec-afdb-ba054d5cf48c/dragon_mania_mod_apk_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fc7c476-bcfd-4c4e-85ed-2956f3847172/doparazatip.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/hack_coin_master_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/wibuxowup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d210a77-8486-452e-aaed-dbba3d5e0936/university_physics_14th_edition_solutions_manual.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_off0000d136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD136 5276 bytes
SHA-256: 12a6b252d7a2b8bc1595e1e94df1fb56a0a085ed2713c7ff58b69581d4640343
font_01_sfnt_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 11620 bytes
SHA-256: d60bf0afcf1050780918d52d1013338d6666ca61f6ee18e50ea67932ea9a8257

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