Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c4e1ff500abcdb…

MALICIOUS

PDF

71.6 KB Created: 2021-09-09 22:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07f33f6c62e5baa2fde512c6c1986be6 SHA-1: aee65d0f94faddc692e00fa192b43887f81aba9b SHA-256: 70c4e1ff500abcdb97590371505268f936181e40879b2c30097f04387c4209ac
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 a large number of embedded URLs, many of which point to disposable domains and are likely used for phishing or to redirect to malware download sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=wentworth+season+8+episode+2+free+online PDF link annotation
    • https://lostfoundglobal.com/userfiles/file/3355904966.pdfIn PDF document text
    • http://remobudostol.pl/pliki/sopibunupiramarevi.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/xalozogeboxevafemuxirape.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/togafavosojak.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/31962324122.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/joxabagarudagowobubeb.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/monolego.pdfIn PDF document text
    • http://strap.sk/uploads/files/jufewemuvewuzeza.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/zudamejepiretuliwof.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/54132486765.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021090902013573499.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e73a117db---gewivabusisimuvagabevare.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/65249148400.pdfIn PDF document text
    • https://drlanda.hu/user/file/62646062931.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/xoxinugevamow.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/wawabiz.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/48514229809.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/zaxudixux.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/zowuna.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/vitolexagivezovunogo.pdfIn PDF document text
    • https://people11people.gr/uploads/File/zasigomezefun.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210902115603.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/56732531917.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/19972252851.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_off0000b690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA2 15892 bytes
SHA-256: ef6839aa84d859238d3217354d3a16e8dd9203e889fd17f0746cd8bd41a27ba8
font_02_sfnt_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 11000 bytes
SHA-256: 9a60c51998e5a6a305fe7fd815de3bf376c55fa50af5938081f031cdd682a1e7

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