Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7150f85044e2a2…

MALICIOUS

PDF

75.4 KB Created: 2021-05-10 16:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 83c6936ec7a06895350631179c093629 SHA-1: cfe2ea253c5f3dc4e2363381e999b38ff2a94ddf SHA-256: ad7150f85044e2a254840d84b1f139f2c004120d2cb4569233f0db0ab7f45684
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme. The document body is heavily obfuscated, but the presence of a URL related to 'stock value' combined with the malicious verdict strongly suggests a phishing attempt to redirect users to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://bologen.ru/strik?utm_term=how+to+read+a+stock+value+in+python PDF link annotation
    • https://cdn.sqhk.co/wexovezojab/uhjghkw/gapowaguwiwa.pdfIn PDF document text
    • https://cdn.sqhk.co/koxuvusu/7q2Ucjg/63887018982.pdfIn PDF document text
    • http://nedosako.iblogger.org/does_pua_still_get_the_extra_600.pdfIn PDF document text
    • http://frut-tree.site/rifofeliho573.pdfIn PDF document text
    • http://damomemisogadex.iblogger.org/rugemakotufalop.pdfIn PDF document text
    • http://janurikemodowu.iblogger.org/formation_assistant_administratif_alternance.pdfIn PDF document text
    • http://fb-ig-violation.com/66729562176i9v93.pdfIn PDF document text
    • http://seamanygau.best/how_to_teach_the_art_of_conversation7j3ka.pdfIn PDF document text
    • http://musuwefamomare.22web.org/82374309517.pdfIn PDF document text
    • http://gprofights.ru/gewogifattgxm8.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/VSOhChe/towewepolivu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://revupeponalewuj.epizy.com/berlin_public_transportation_map.pdfIn PDF document text
    • http://bilodevufutumu.rf.gd/porelutipikokitawuzegif.pdfIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_9810b693484d4c9daf0fe2ec9d9b7975.pdf?index=trueIn PDF document text
    • http://feselipalez.epizy.com/encyclopedia_of_chart_patterns_espaol.pdfIn PDF document text
    • https://50c84cdf-c8d4-407e-a307-361b94491100.filesusr.com/ugd/f2656e_5079846be0d84c2fbecf9e29ec2c5d45.pdf?index=trueIn PDF document text
    • http://jumebesatupa.epizy.com/open_office_free_templates.pdfIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_5913b4f46f4b4bee9ad5e4ee179aa72d.pdf?index=trueIn PDF document text
    • http://lisinawat.rf.gd/modaxobejozofodijin.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 5440 bytes
SHA-256: 0fe848f26c33d7bd14e74d60a57d8e808a20ae32f2a792f613842545dbaf1769
font_01_sfnt_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 11520 bytes
SHA-256: 10777c59e2dff579e23ec1edf237e95dbb97f85f309862d04cc6b9f2806a458a

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