Malicious PDF — malware analysis report

Static analysis result for SHA-256 44443750169f8298…

MALICIOUS

PDF

84.0 KB Created: 2021-09-11 15:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 163a2952a2944f106b2fb6821bc4cdd9 SHA-1: 49d5e8c5c72c20eb62352da4b7d95c1e808aac97 SHA-256: 44443750169f8298bd7fdda7fd0c65e0c0973247a8d16251809f6494b6e4c4de
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm and a callback phishing lure, directing users to potentially malicious PDF files. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to download and execute further malicious content, likely through a client-side exploit or by tricking the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://dambi.pl/userfiles/file/6191604065.pdf In PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/lovawux.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/sejuguvasapukotuka.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/gumuxufojojosam.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109020337477443.pdfIn PDF document text
    • http://logicamail.it/draft/media/44032119440.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/buxopoxolaruxemesamagijij.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/tazatilifizudanofofefumon.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/gudibisumadetogelo.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091101253473499.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/55213225333.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/fipuxirididanaped.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/bexoxaf.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/xuvonidusemobeg.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/88917603758.pdfIn PDF document text
    • https://qkon.ca/images/file/19519436793.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/37085063807.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/39251810575.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/22903498051.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16132ae8d7bac0---kazewanowitedanaxeniwesu.pdfIn PDF document text
    • https://termofriz.rs/files/59406435626.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/23506593072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=best+phone+under+10000+bdPDF 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_off0000e3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDE 10656 bytes
SHA-256: b7425233ea871fd2031d24ef2ca4d91b8b8af3149505c923377b4cd8ce4a3bb9
font_02_sfnt_off00011402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11402 18056 bytes
SHA-256: bd60c94354b8200a810a34250a5a617bac822f557aa47e58721f53dede9908d5