Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9f772af2185bcf…

MALICIOUS

PDF

77.0 KB Created: 2021-09-20 00:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 40eb4fa151c929ecd7eb18af25b4e21d SHA-1: 0c99be437b87071ee7642d83ee28233a3f247d29 SHA-256: aa9f772af2185bcf0a0fca1be683f29bcdf0cf52e542086c812e7da2431e38a0
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 are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The presence of these links suggests an attempt to direct users to malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synerhu.ru/uplcv?utm_term=flash+imei+android PDF link annotation
    • http://oryginalnedekoracje.pl/userfiles/file/galeruxepuzeguvula.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091906014373499.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/55681635632.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/mejosazafuzonamezevez.pdfIn PDF document text
    • http://storemisr.com/uploads/files/xazapodezizowo.pdfIn PDF document text
    • http://thaide.org/userfiles/file/degaw.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-13/20210913010808639152.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/65306283377.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/zaritulebaxuke.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/7668503594.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/9466778982.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///ninekuzarugonudunolog.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/retekupufagirikawedus.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/vilinejemerumiligovexe.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/79817279168.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/sanoxupamu.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/68572115173.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/41978890101.pdfIn PDF document text
    • http://sapthagireesyathra.srikarpagavinayagamills.com/userfiles/file/mojelibofi.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/2309667414.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/56354719814.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_off0000caf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF9 10392 bytes
SHA-256: 660630263f0addd1cf513e7b22ceed4c55e91760478c87ee43a12066af43c4d1
font_01_sfnt_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 17220 bytes
SHA-256: 7f07d8298f0c69cee7fecf7403239612a7db01fb6c6e8a2ca3f8b272e052afbd
font_02_sfnt_off00010e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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