Malicious PDF — malware analysis report

Static analysis result for SHA-256 44216f30aae38ee0…

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 09:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 36b9b319668f609907fc42f9ed28955e SHA-1: 922d4dee00da160a8c49ccd97d446af81fef6e5d SHA-256: 44216f30aae38ee0535bb8a16074af5817f2551183f2201a9c7c8a74f9984568
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The PDF structure and embedded content suggest it's part of a phishing campaign, likely using spearphishing attachments as the initial attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=deforestation+effects+to+human PDF link annotation
    • http://eyela.kr/uploadfile/fckeditor/file/12112995298.pdfIn PDF document text
    • http://onlinevay.com/upload/files/xarekus.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/15186855805.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/roleviwagenolava.pdfIn PDF document text
    • http://scantech3d.com/files/vozawuduxajazef.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbbe70c946---kewexotijuxejuzivezedato.pdfIn PDF document text
    • https://premium-house.uz/images/file/lemebefuzumuj.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210906170759.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb62c429b---detin.pdfIn PDF document text
    • http://scarpatti.com/files/gagufu.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/tozeguladanekofabujifimuk.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/pijoreme.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/43045246859.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/37253705971.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/68143984876.pdfIn PDF document text
    • https://mavibusiness.it/file/mojitixikoralume.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/59032215583.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/taseno.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/kuwutoxijenujaxon.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/13370653893.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/20235393538.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/44769646167.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/81822263805.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/nosefumofamefur.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_off0000d498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAA 17260 bytes
SHA-256: 566be1cd140edddfa30aa6dabd4be5d4dea2ccd6b478beedee6eee74c7eccafb
font_02_sfnt_off00011953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 10656 bytes
SHA-256: f909995b3bd5a8c01237e474b59aaa2a2bb69056607478110ec4aa4ca9bec4c8

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