Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b1f0df249f4141…

MALICIOUS

PDF

77.7 KB Created: 2021-09-17 18:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 98906199b684fb23f95fbb059654bc9f SHA-1: 915215c71e3508598f7fac568ef13391644bacc8 SHA-256: b2b1f0df249f4141cab172733e14ab3f42fa5ef128440fcbaaa9243fa3e25c9d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to host malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and the link farm heuristic confirm the document's role in directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=how+to+change+country+code+on+android+tablet PDF link annotation
    • http://reklama-kemerovo.ru/files/files/23591416496.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/88097081486.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/99995254415.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/32105176814.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/93255376327.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/gigobovuje.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/mudurezosuzawedidijosov.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/55620608420.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/56376241590.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/wupekunuzesese.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/86980172208.pdfIn PDF document text
    • http://forti.in/userfiles/file/4781502193.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/94446030018.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///sejotogerobenodilubivevu.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/renod.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/12366917637.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/38674218671.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///62627649123.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_off0000c8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F8 18580 bytes
SHA-256: 00b0e4183bf4274bf83c3ea56286b47bc67637870b0ad947e8bdfe744a6f7794
font_02_sfnt_off000110a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A9 10912 bytes
SHA-256: d4168b831d5fbe2e7dd9a19ddcfb33cb0969a4b7c83d6cd5c531258e4a65b16a

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