Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeca80ba827e27a6…

MALICIOUS

PDF

88.1 KB Created: 2021-09-13 11:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c8135d093eb8b084972bd2544fabe16 SHA-1: d008a0b48e6c3e09cf988e5dbc882d32a0288cf7 SHA-256: eeca80ba827e27a642ac3d26e98fc3bdbdb8de3007aa2cf718cb7a550b0d5fc8
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, with a high-risk heuristic indicating a lure for remote-support tools. The document's content, though obfuscated, suggests an attempt to trick the user into installing or connecting with such software. The presence of numerous external URLs, many pointing to PDF files on potentially disposable hosting, further supports a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://www.primariasantana.ro/uploads/file/zupaxoririlomivetiw.pdf In PDF document text
    • http://chukysovin.com/img-svc/files/gakufusetezalaloto.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/86851848272.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/viworatilaxefujig.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/5978256053.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/41112371460.pdfIn PDF document text
    • http://toonesk.com/upload/58835869135.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/dadepevafugodofit.pdfIn PDF document text
    • http://weldingplaza.com/files/file/84016138711.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/74973883013.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/21645205882.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/lebaligogilupulukokaluru.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/tupevasibivaxavuzu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/91938347585.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/dugodonuwidosulitovuw.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/tulomazupowapotetadod.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/vuwajojixasoladivafex.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/gorijavumevutebu.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/78049791362.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/57239122401.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/28858512064.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613655f47378f---26436755374.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/voxijagedopijewo.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202192447205916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=remote+control+android+from+pc+without+rootPDF 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_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 18048 bytes
SHA-256: 8585b908640f2a22e5a8ffaaa035cdc842ff024c492f18cdc4da52f3fc70e36e
font_01_sfnt_off00012121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13938 10948 bytes
SHA-256: aef673cdf68eb3762ffb8ce0a1ca3c9bb8f123970a23f73bcf83d33c13cb24d2