Malicious PDF — malware analysis report

Static analysis result for SHA-256 710e81e33c77fe8d…

MALICIOUS

PDF

68.5 KB Created: 2021-09-26 01:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ab2b04c9de18f7cab57ccacb6c75c742 SHA-1: 9fe4bd1a3cd8a9f35b8cff4448dd7354abb3d259 SHA-256: 710e81e33c77fe8db0aaa2770496916d098c59e749065e2cc46b3977bcba4564
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, employing an image-only design with a click-outward action to redirect users to external URLs. The presence of embedded JavaScript and the use of numerous distinct, disposable hostnames for hosting PDF files strongly suggest malicious intent. The ML classifier and ClamAV detection further corroborate this assessment, indicating the file is designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=funtouch+os+mobile+price PDF link annotation
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/32084222647.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/wizofopabefazegijones.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/66304866986.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/45870923597.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/sibataxenetorunedorawago.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/58315859989.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/47242412177.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/wepijuguwuvekaxexazejazo.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/pilej.pdfIn PDF document text
    • http://dhf-china.com/d/files/divarotudejarakar.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/27855408603.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/kopifafej.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/5065726462.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/zejofajeregifeva.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/65015487185.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/3137710266.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/79834034879.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/tipub.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/vatojupowuxisivibep.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/98052604110.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/17331227981.pdfIn PDF document text
    • http://signauction.net/userfiles/file/83516172668.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/38057358349.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/laloninewatumegev.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_off0000b0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C5 10692 bytes
SHA-256: ac1c73eb8dd1046225e8ea362f7893bb81baee4a7d7ac6e103c37f82ea332159
font_01_sfnt_off0000c8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CF 14192 bytes
SHA-256: eeb5d423e3ad9b5ba50c6f036995e0ccdba8c9073b0cb1f811c828fc2596e7e0
font_02_sfnt_off0000ec3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1