Malicious PDF — malware analysis report

Static analysis result for SHA-256 552071279be1981f…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 18:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: caf86133c71282e5ca862da2d59b517d SHA-1: 4aa7fe641c5cf626c031be1b825dd5b59e58027f SHA-256: 552071279be1981f8a2cf3403e7a155577f861db573788514f86fa2b9b7c8746
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution PDF. It contains numerous external links, with one specifically identified as an algorithmically generated URL, suggesting an attempt to redirect the user to a malicious site. The PDF structure and numerous links indicate a likely spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=final+fantasy+vii+mod+apk PDF link annotation
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/dipezoguviligedezapife.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/74069407608.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/67865009526.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/fututuzovafivowa.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/zujajewunasijusok.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/1169747583.pdfIn PDF document text
    • http://metzlerranch.com/userimages/dejedisosigojaxozazemexuf.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/kanigo.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/30298773262.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/depumipibi.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210907_2775F22CC376C25D.pdfIn PDF document text
    • http://orderkai.com/uploads/files/fimesolirafolujelejodof.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/videpaxonoretan.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/zater.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/polikujase.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/81634093937.pdfIn PDF document text
    • https://kawanmto.net/contents/files/kumezu.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/regenunilege.pdfIn PDF document text
    • http://18554080.com/userfiles/file/luweregowan.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/79052962803.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/gisebifaz.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613896e2cb492---gulusekexejibanilixokosud.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/nazadapajabagazujerisivo.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/1844531966.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_off0000cc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5E 10676 bytes
SHA-256: e3ac88d3361c0a7c6634f8c71b4a3daf3aef6e488dba028615e71668067bca65
font_01_sfnt_off0000e4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CE 17864 bytes
SHA-256: 9c5acc87950ba2b95e57401fedcd18a66b15c393b9327427ee36c99c5d641f2b
font_02_sfnt_off0001137a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1