Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd72bd78b62da8b5…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 05:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d1784e2cde960341d682b62d0edeb69 SHA-1: 1f04e5b7a585d180ced8db1186898d0f7955a81d SHA-256: dd72bd78b62da8b5e593e78c38c03e0b84d197aac631139869a54724245194bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=engineering+fluid+mechanics+solutions+manual+pdf PDF link annotation
    • http://integrotech.pl/zdjecia/file/31510756273.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/ralusojatum.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/wororiravuge.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/toxenelopa.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/dijazok.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/detizutidisusisak.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109231622344513.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/44915563404.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/tavumunafixivenubunosiled.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-5/20210905124808566142.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/16857009964.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/xesimomur.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/losoxikudelipirisavose.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/89090499307.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20168326647.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/xoxirukesobile.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/pagerolazowi.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/funavisatogulujuzum.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/funoxuzasolakegopakeve.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1bd78cc93---67829946636.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/tilirovagageduvexopepoda.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/93961003361.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/saloladew.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://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_off0000aee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE1 15612 bytes
SHA-256: 0e67dec69b67d85dbd092caa82851e9d879dfe0eb9fc95c45d55497983a637d5
font_01_sfnt_off0000d6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECB 11152 bytes
SHA-256: ea416950627ad52788ec17e4f3ca15fe13ea25f970098f39c39cf2264738efdb