Malicious PDF — malware analysis report

Static analysis result for SHA-256 271f739709a77cc1…

MALICIOUS

PDF

94.8 KB Created: 2021-09-13 10:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a3b15ef7a26b7e5b4afc7ac4f8f18c29 SHA-1: 1ceeaa47cef8b90a4d29882837da6ff1df2aff01 SHA-256: 271f739709a77cc18c2d4ae44a324aa257df18536ecffd9b12d102fe4522a6ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF structure and embedded content indicate an attempt to host or link to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://permagnet.com/upload_files/file/2109032001481830475yr9cb.pdf In PDF document text
    • http://kmconlinecme.com/userfiles/file/24054875609.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351278522bb---davakanoparud.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/31317603759.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/nigowodosenatikobipoga.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/paxaje.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613c32571d085---98445337174.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/18435876871.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/liwafavotubulada.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/jufirekopatezulup.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/wopobinupemifozugu.pdfIn PDF document text
    • https://onlinendttraining.net/files/51838982923.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/17617122858.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/sojitotexodizeriboja.pdfIn PDF document text
    • http://dhf-china.com/d/files/dixirujixipobuwafe.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/28875731270.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/55146782107.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/belig.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/63600928428.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210905135600.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/karekodusunovezalijab.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/fovadamekusufodemezivobu.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/gadiruxuzadadabulutojilor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=befikre+full+moviePDF 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_off00011111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12928 10152 bytes
SHA-256: 14441f54dcec8b3a577c85bf2228090e012fd24b70f0cbb9accf35710f568a75
font_02_sfnt_off00013fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE1 18088 bytes
SHA-256: 242acc8d84ad63f8bada2882a1430aad5999f539e4d12f6e34c961f4af93f36a

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