Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3fa13a3a7cc8da…

MALICIOUS

PDF

88.5 KB Created: 2021-09-12 02:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ea5745f06511f6fa157eed8591ed51f8 SHA-1: 41c0e82d293cd83857f3278dd9572b3efa5d8f11 SHA-256: 1f3fa13a3a7cc8da43c11dc871924c8806b39529910d70a16c1a97c15ff36244
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=how+to+speed+up+wifi+on+android PDF link annotation
    • https://mogilew.ru/userfiles/file/najegutoboxematurivekok.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/22729296430.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/jemaporumevupepetirewef.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/96543924627.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e65dd4e4---97490584703.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/60918291065.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/dinuwopisekezawuvalig.pdfIn PDF document text
    • https://maisonforville.be/documents/file/xomuzawadobuju.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d7a2eafd390ffabaa0511851caa7f272/kinalokukasobipobubarilil.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/saregaxasexenurukisuv.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/76175021647.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/rulokosunesitenuvad.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/40968070908.pdfIn PDF document text
    • https://bem-sa.com/img/file/95725524750.pdfIn PDF document text
    • https://nyig.com/files/file/19459397497.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/jozomeraxuwisa.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/2711626788.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/70694349051.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/39972846387.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/53892128055.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/33145476184.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/45754232483.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/20579770819.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_off0000f49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB4 10624 bytes
SHA-256: d3b898eb9bd09c964445666e26075d60291b0c85baa408b52d26fdcd88d10541
font_02_sfnt_off00012523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12523 18204 bytes
SHA-256: 9dfa0b4aaccc6012db1b8baa9c785243804748baf986bb34556bc8ec277791c2

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