Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e0521fd645a6a3…

MALICIOUS

PDF

68.3 KB Created: 2021-09-15 00:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 21dc0f5b92bca645c629091c25c50cc8 SHA-1: b79a521aafeab4f72b1ce75a381df3cf2ae208f8 SHA-256: a1e0521fd645a6a3c35852e5d480c486857da4331b347a0a06213a10e6760a37
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and embedded content, though obfuscated, are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://oniceh.ru/uplcv?utm_term=before+night+falls+movie+free+online PDF link annotation
    • https://zlataraburmevuckovic.com/files/botuledorijixulemoma.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/zereta.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/vabumodugizexi.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614090d542f57---voxilagofogexuli.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/68067592106.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/93589612343.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/59299012049.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/nidugeparofamodotujarike.pdfIn PDF document text
    • http://unseretochter.ch/images/file/3092685735.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/66605862125.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/26233996334.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/ferimaroxivavemativas.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/votibiwuvibodigow.pdfIn PDF document text
    • http://penetrat.ru/files/files/vajivosagab.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b0e4bff41---55926737090.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/zozisiveketiluforat.pdfIn PDF document text
    • http://dfanchem.com/upload/files/32373377295.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/rawutowazewilu.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/57111543779.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/momotagitelop.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/vuwefiluvisevizixuza.pdfIn PDF document text
    • http://altus.pl/userfiles/file/58556092624.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_off0000aeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC700 14324 bytes
SHA-256: db3c82db58098ddf986b7b11276c6ec9b126eb7040434fe8f683fe60a51bdbba
font_02_sfnt_off0000eadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 10780 bytes
SHA-256: f280b82d808d2d49186b9fcecebabbc606f8ce243df0c486297d71b574093735

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