Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6ede708d1709df…

MALICIOUS

PDF

80.1 KB Created: 2021-09-10 03:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5014316102cd2ffc85d5d2d29af2f912 SHA-1: c5f5f807371bac1414f9f79d5fc2b4870ad87578 SHA-256: 4e6ede708d1709df9e172659b8d554f72ad49a31d9272970be4cd53a7b16f4eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The presence of 'utm_term' parameters suggests tracking or redirection, common in phishing campaigns. No scripts were extracted, but the overall structure and URL distribution indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://irlanc.ru/uplcv?utm_term=android+software+for+windows PDF link annotation
    • http://zhizhencn.com/filespath/files/20210904041402.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/zibebizawo.pdfIn PDF document text
    • http://timocomputer.cz/files/file/midikokuretovamawa.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/kugavetusudijodokosezuju.pdfIn PDF document text
    • https://ubranni.com/uploader/files/14824850253.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/10595583239.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/texorobadus.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/jikutimitiwiru.pdfIn PDF document text
    • http://asfalon.com/__files/file/vevetozopuxetetaguj.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/66509216945.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40178860917.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/dipakenetulo.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/sumezadivajile.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d664f300---70178938123.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/wataxigapaxut.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/75402739578.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a961d025f9---39438876504.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/gimaxawojazofulovuto.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/74940544950.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/25079655934.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/83883531847.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/1608639082.pdfIn PDF document text
    • http://tencanpowder.com/d/files/55787190259.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/galapigunojazegu.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/80053486026.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/24710725223.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/vesenibileriwukikubi.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_off0000d733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 16832 bytes
SHA-256: b48cbaef2cf0aedf5eb567d4bbc3fb5a3bb6749cf790da8d219ac98eac7d441c
font_02_sfnt_off00011ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE0 10368 bytes
SHA-256: 2eda7bdbbe4d50eac7546d6640eb52e7df13534c9cd6064f49fda49fa1d6be08