Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e86bc8a1eb2ddc3…

MALICIOUS

PDF

73.7 KB Created: 2021-09-13 20:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 54744f875089f36ac6a448e5f7ccf7cb SHA-1: d3c9979d3ba185eb335d7f5c915669391ccd66f5 SHA-256: 8e86bc8a1eb2ddc3f759f4df6b38e17ea0209c1b34cdc8bba7ab96c2e8b1420e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to potentially harmful content.

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 https://sieuviet.net/webroot/img/files/rimujokojid.pdf In PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161302f6287998---20047421079.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/27205130762.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/25586414570.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/95099732871.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/wanefu.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/58532841671.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/makuvoguxozimozumiserer.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/laferigowugapibivapawemo.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/poroxemuje.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/20958041377.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/viteguginanopuwusoko.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/36375796961.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/27488884866.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/doditemomogaboxil.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/kafejepad.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/zeranumul.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/98265423988.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/kibesoponidixifadetebuk.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/3773832040.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/55091696958.pdfIn PDF document text
    • http://irinabailey.com/upload/files/7258600926.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/sagowidubalabipabebid.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/tolajo.pdfIn PDF document text
    • http://baoveantam.info/upload/files/zanozuvijolazozomoxosit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=android+application+for+call+taxiPDF 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_off0000bed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED5 16356 bytes
SHA-256: e808c50b03ffdd82494afdc38bf77d6cd4247182f1a973b8912740811a60b230
font_01_sfnt_off0000e934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001014b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014B 10396 bytes
SHA-256: 936ea45feb2b82d5d201d24dd4d0f82d190a4e9ee5bc2e5a67a0dc1acdd28ce3

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