Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ecfa32329513b6…

MALICIOUS

PDF

75.4 KB Created: 2021-10-04 01:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8e93f1ddb0c355620d02f8eb7f2ace36 SHA-1: 4629bf3433cfa2a895ad88a79fe52ddcae47468e SHA-256: e0ecfa32329513b6924df5bf0f207c1a53bc4a2f2c1761c3b37e63aab310b8a6
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and numerous extracted URLs pointing to PDF files suggests a campaign to distribute further malicious content or conduct phishing. No scripts were extracted, and the document body was unreadable, limiting the ability to determine the exact payload or lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://hcpcsz.com/upfolder/e/files/20210928041916.pdf In PDF document text
    • http://hide-bo.com/img/tmp/file/58627764378.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/56430962657.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/82083214282.pdfIn PDF document text
    • https://harom.ro/files/file/4164452622.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/setozosojudara.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/gogapu.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/72001003912.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/femewowolenefew.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/79200206333.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/28196569372.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/51566619673.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/naduxipegawusoxogevesex.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/78047815341.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/xonidafixovarina.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/94848030128.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/63512486480.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mopubosuduvituzobude.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/wabutijasedepaga.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad954c9b21---wojisux.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/84765652390.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/pizugosekeratano.pdfIn PDF document text
    • http://www.moyekolodin.com/files/56342882200.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/tumemape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sickle+cell+disease+causesPDF link annotation
    • 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://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_off0000c15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15D 10208 bytes
SHA-256: 69e58dd43cefa20d06e212012fb884d9ba6259d7f3bbd57525f1234ac257faaa
font_01_sfnt_off0000d854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 18320 bytes
SHA-256: 34c81b9acc89474731166ac4aa4b885e93f351cda6f0525bdbc9d5405a66cf96

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