Malicious PDF — malware analysis report

Static analysis result for SHA-256 c648bc2be6c79264…

MALICIOUS

PDF

81.4 KB Created: 2021-04-08 00:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a5995d9f1ef37e922c610aa122f480da SHA-1: d98ae00d4de491d6d54785fa3765298b9c574bd0 SHA-256: c648bc2be6c7926420a3267f526d40b531d135be12c14cd8e50f7db6c40e19bd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URL 'https://soxebez.ru/wix?keyword=what+does+a+cash+receipts+journal+look+like' is the primary indicator of the lure content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/wix?keyword=what+does+a+cash+receipts+journal+look+like PDF link annotation
    • http://jomikifu.medianewsonline.com/astronomia_usp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428069/normal_5ffd3fc172335.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/33309188261.pdfIn PDF document text
    • https://pebarefilegiz.weebly.com/uploads/1/3/5/3/135325086/b3cdf6261bb.pdfIn PDF document text
    • http://wekabamile.22web.org/esercizi_sull_analisi_logica.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467017/normal_5fdd7f9eb984c.pdfIn PDF document text
    • https://xuxufidumexed.weebly.com/uploads/1/3/2/6/132681394/netidivebiru-venopid.pdfIn PDF document text
    • http://sepuwazedano.iblogger.org/metafisica_de_aristoteles_garcia_yebra.pdfIn PDF document text
    • https://wujumumokujot.weebly.com/uploads/1/3/4/6/134613036/5394544.pdfIn PDF document text
    • https://lekomuge.weebly.com/uploads/1/3/4/7/134773229/fopupiweli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fejuzezoj.epizy.com/free_movies_link_list.pdfIn PDF document text
    • http://satawakerexe.atwebpages.com/gizinuwisej.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_9d4f760fb10e49ed9217aa8abc16c7da.pdf?index=trueIn PDF document text
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_616719023e3e4489a1add2f6bdac0c63.pdf?index=trueIn PDF document text
    • http://deroselewem.epizy.com/6380218202.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_c6f8f1a66148400b92d27c209c9751ac.pdf?index=trueIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_fae5f690ef2143fdb866257c66ea89db.pdf?index=trueIn PDF document text
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_75de0116de094ee5bd88757ce8c1fab3.pdf?index=trueIn PDF document text
    • https://b3159766-6c8b-4733-a97d-e59ef6783693.filesusr.com/ugd/21851e_5c6438d4d62d41d4909dc8244f3121bd.pdf?index=trueIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_1b026e8ade7640d48391424f02686ecc.pdf?index=trueIn PDF document text
    • http://gusozafameximi.epizy.com/apache_flink_for_windows.pdfIn PDF document text
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_bfcb5e3a1a0640baa59d77b9711e03da.pdf?index=trueIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_dd5d56dbb4244a0d9ac6bdc34734f577.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 4648 bytes
SHA-256: dd70d2fd41ac43622837ca704ad8b3e33674ce017abf742aa898da024739e84b
font_01_sfnt_off000101b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B0 5316 bytes
SHA-256: 321253597301efb67f961dcc07bad57a8cf80a37583e12ac6670ef6e7767572a
font_02_sfnt_off000113cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CC 10468 bytes
SHA-256: 3264a255ce973bccd744f816ffb746cccb5adf19dc295cc41a0c56e46cd26f8c