Malicious PDF — malware analysis report

Static analysis result for SHA-256 844e60589ed81a88…

MALICIOUS

PDF

84.6 KB Created: 2021-09-23 20:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a51d9d53be67091474b891dfd0165e7e SHA-1: 84d5ba075daac891668dbde81923a9920ff3166a SHA-256: 844e60589ed81a88e653fe5f5bc30d0ddc0ff45584ce9219d910f4ea35d1fd4b
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs pointing to external sites, with one heuristic specifically flagging it as a 'PDF_SEO_DISPOSABLE_LINK_FARM'. The presence of many distinct hosts and the use of UTM parameters suggest an attempt to lure users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://tinhdaurosa.com/Images_upload/files/15297970938.pdf In PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/rikivenaxu.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/kufolexofabogusejos.pdfIn PDF document text
    • http://synfarm.com/upload/files/47397500983.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/tapisiteguzepupus.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/popumojakoxifolus.pdfIn PDF document text
    • http://chpcentre.com/files/file/subigowisa.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/458a23722df823e16bde631305c874dd/tabosemotegaze.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/gowusazademopobun.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/porotowirijake.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/26736749756.pdfIn PDF document text
    • http://briztravel.com/upload/files/47455888405.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/9035573228.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/11773438438.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210910151725.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/fatenaxed.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/25523605075.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/21331983063.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd159a36f---78685298604.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/7798625155.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/palepaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=candy+crush+saga+hack+iosPDF 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_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 18648 bytes
SHA-256: d6b33fcdffc1ced1722b9d8f2117dd4f4cf98bb33bd16f60ad0a4334f86fd22d
font_02_sfnt_off00012c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6B 10712 bytes
SHA-256: 309963eaaaf2966a322e42fb4e32b6405e2a2cf17729e49679710cae7e1797c7

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