Malicious PDF — malware analysis report

Static analysis result for SHA-256 7352d6d328e8667e…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 02:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bcbdede54f0009a21a628cc4b966d5e6 SHA-1: b90844a0ff2505e64c6adb13dd81015701d3aaac SHA-256: 7352d6d328e8667e0251d49fd29027e665e5a04775bd1913f73de246cc3babd8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm, identified by heuristics as a potential phishing or malware distribution tactic. ClamAV and ML classifiers also flagged this file as malicious. The primary attack pattern involves directing the user to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://acsalma.hu/userfiles/files/pejewogulavuguzivapedon.pdf In PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109190855157438.pdfIn PDF document text
    • https://arerp.kr/data/file///zigifafinujufutasefeti.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/92260830016.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/70310003405.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/68pvs98653jfoji8miinodp036/12208178614.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/futopixolosonibimojozuwew.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/52075895411.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf30a56a9---kifefesexig.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/41667914011.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/kimotirazesisadebev.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/10830915183.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/64908391062.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/gevepego.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/24977483568.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/14587164012.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/51437528708.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///zizivaxajetikesugoxu.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/bagugesosugu.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/85901207863.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/fadurakabev.pdfIn PDF document text
    • http://hidramaco.com/files/files/palulixapemipusurataf.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/37200110148.pdfIn PDF document text
    • http://kme-kme.cz/files/file/94634283007.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/fonarenobepenodibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=windows+8.1+genuine+product+keyPDF 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_off0000cf7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7D 18672 bytes
SHA-256: 57dbbdd2cd847b79e1da3138f507c714272a8bb75f709beacfd54ba537608e27
font_01_sfnt_off00010119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11930 11192 bytes
SHA-256: 45d4354459e45e2e00f47ae787a28a83895bb8f4318c534beb3f22b0810beac6