Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5195eb64bf16e84…

MALICIOUS

PDF

91.7 KB Created: 2021-09-22 18:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a49ea5e0b09d62fb06a897742c7ac5bc SHA-1: a44459e14b6948c16c9cd89d7252538bfdbbb75f SHA-256: a5195eb64bf16e84ffa89324add8aa3e54c749d9b5196540b9d20c7c15e8629e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to suspicious PDF files on potentially compromised or disposable domains, indicating a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting an attempt to obscure the true destination or distribute content widely. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attack pattern involving redirection to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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.
  • 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://clubesquilacoma.com/uploads/files/xikevikejufozi.pdf
    • http://hasdeu.md/data/userfiles/files/jokipopelatotosopibuf.pdf
    • http://deepakbatteries.com/uploads/file/6458453997.pdf
    • http://www.binghan.my/userfiles/file/43736489487.pdf
    • http://wooshin.kr/uploaded/file/4258136356137265f95b8f.pdf
    • http://hb-hospital.com/file_upload/fck_upfile/file/68861050211.pdf
    • http://architectureanddesign.it/userfiles/files/72004927890.pdf
    • http://sipsak.nl/userfiles/file/lomodopuri.pdf
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/56182689550.pdf
    • http://streathamtaxi.com/survey/userfiles/files/fefukigosifawikase.pdf
    • https://sedefartphotography.com/resimler/files/65553476129.pdf
    • https://aedwea.com/upload/foto/5935725766.pdf
    • http://agrobud.net/uploaded/file/1586443735.pdf
    • https://debo-fit.be/userfiles/file///sinorafokevufuj.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/55e4ee36a5e0a3c4ee2596a3a51ea8c0/51402113972.pdf
    • http://barbusci.it/maisUserFile/file/71265583708.pdf
    • http://dayuntang.com/assets/uploads/ckedit/files/20210914090244.pdf
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/bafur.pdf
    • https://sunnyvale.com/wysiwygfiles/file/gefagu.pdf
    • http://studiolorenzino.eu/userfiles/files/16156842872.pdf
    • http://uelzecht.lu/userfiles/files/63119766171.pdf
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/segerenaxolega.pdf
    • http://catherine-massage.com/ckfinder/userfiles/files/91269711504.pdf
    • https://repetitorebi.ge/userfiles/files/20170971060.pdf
    • http://omatsuri.kr/data/userfiles/files/66574780193.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=free+full+war+movies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104de.bin
d15c650b8952be6710ca8670f869d8dc2b11816e86c38b1f8d388056b4c54fb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 10400 bytes
font_01_sfnt_off00011c78.bin
4e6ecbe85584c859088a17af0dbe1657d4717df775a92ff022ea5f99052af11a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C78 17228 bytes
font_02_sfnt_off00014933.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14933 16792 bytes

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