Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e55ae1fe70af7ec…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 00:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f2984e2f3c5d6f75d18a5a21aa81ee83 SHA-1: 63800d49f6af1321320ce8fa2fb3adf40ab09043 SHA-256: 4e55ae1fe70af7ecb4cb27784441c28cb44e6700ebc563182166329cacb3a976
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=mutilate+the+doll+2+unblocked PDF link annotation
    • https://ita.kru.ac.th/ckfinder/userfiles/files/wugisetuvarajelomexe.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/ritodepexatirifivigodi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c40e0d2ea.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/83333674556.pdfIn PDF document text
    • https://dm288.com/slicice/file/lirowepuxepero.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/10403841358.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/pekol.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/75492461736.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e897dd266d---badizelexenapaxetofez.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/zufom.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/34585243962.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/sedetamezag.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/2278374769.pdfIn PDF document text
    • http://uchid.com/uploads/file/96516959032.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210914093740.pdfIn PDF document text
    • https://europartner2.pl/uploads/10889793092.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210915_2CE211D2FED845E3.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/bujipe.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/wigenodoru.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/zijupez.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/92643714337.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/xirifupigopinojogolawu.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/69216580189.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/tonivoba.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_off0000d4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FE 10644 bytes
SHA-256: 458d8401144e291209d7a788128385ea5e4c6a674c4d16b61fbbd7e09bf7a8fb
font_01_sfnt_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 18392 bytes
SHA-256: 31bebe2a4f0160876088bf234d46b53e1bab1087c2445b2b887b84c53ae9b5d1

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