Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f26891fc088db75…

MALICIOUS

PDF

72.5 KB Created: 2021-09-20 09:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f57d06e32ed228073bf05ef832de6319 SHA-1: e01630162f1c97939a45a7c0f263af980559c6c9 SHA-256: 9f26891fc088db7554a90d82b3e0559034b97a85b5c76c3ba249c58ec0f186ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic analysis indicates it functions as a link farm, directing users to numerous distinct domains, many of which host PDF files. While no scripts were directly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://brickchamber.com/ckfinder/userfiles/files/58159412953.pdf In PDF document text
    • https://larioenergy.net/uploads/file/kereded.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/16880867737.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/vomapulovoluwadiki.pdfIn PDF document text
    • http://lulanjina.net/upload/files/31983868976.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/57900263871.pdfIn PDF document text
    • http://asid.rw/userfiles/file/giseniwubebukipugudamek.pdfIn PDF document text
    • https://vitanov.rs/files/87643605463.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/11005143242.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-09/21090908473772905774e1vcyv98yh.pdfIn PDF document text
    • https://digiconelectronics.com/media/56327406371.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/77888194095.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/kuwojelezozuroganisixutif.pdfIn PDF document text
    • http://cke.hk/userfiles/84853587637.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/27967587206.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/58911148498.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/fudofarodezid.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/kubez.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/fixalutipunexevagigafun.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/maduwuxemubiporubab.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/89594177285.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e7f1dae06---13215012613.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d8cc1f9ca---69074180607.pdfIn PDF document text
    • http://hkacca.com/userfiles/xozon.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/71220131721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=latest+english+movies+online+freePDF 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_off0000bb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB35 10684 bytes
SHA-256: c994ded7235cf80fce715f15a9f012eb3ddb3455baef4ea8a9e06243b280271a
font_01_sfnt_off0000d384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB96 16012 bytes
SHA-256: 4e8bbe0944f50a757876b59f3413df3a4f513725327f1c3b6b865f8d41a36c15

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