Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0034fc8cc0dc0e…

MALICIOUS

PDF

83.2 KB Created: 2021-02-15 00:00:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f63952a367964fafaedacc4aa497994 SHA-1: 9b79b019a355e783a9212f46d0f4c12d0b4cd0ee SHA-256: dc0034fc8cc0dc0eb213474171610d20fe1987bf67e1b6f37d8b7cc39a46c3db
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The PDF contains a large number of embedded external links, many pointing to Weebly domains, suggesting a link farm or phishing campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=the+amazing+spider+man+2+apk+data+mob
    • https://vobanugan.weebly.com/uploads/1/3/5/3/135340106/napoguvimipe-gegatidiba-zipalexedax.pdf
    • https://sujarusokebukok.weebly.com/uploads/1/3/1/4/131437349/9640214.pdf
    • https://pugiputofal.weebly.com/uploads/1/3/4/7/134740318/7911173.pdf
    • https://cdn.sqhk.co/nunewole/ii2hfvP/95078352662.pdf
    • https://dolujutizividev.weebly.com/uploads/1/3/4/8/134864897/lumanekilopo_xomegibilazaze_sobumubirumoge.pdf
    • https://tosoremekik.weebly.com/uploads/1/3/4/7/134771766/mezamuwuwadozuf.pdf
    • https://cdn.sqhk.co/fuvebopeweb/eDqZuq7/wedexuwidozitaluv.pdf
    • https://cdn-cms.f-static.net/uploads/4485810/normal_6020a3a6cbbe7.pdf
    • https://static.s123-cdn-static.com/uploads/4369663/normal_6006bcb2defd3.pdf
    • https://cdn.sqhk.co/goxobuve/clgiXgi/gesuzupoxufe.pdf
    • https://cdn.sqhk.co/zitedefew/H9FRhgd/grand_theft_auto_vice_city_remastered_ps4.pdf
    • https://cdn-cms.f-static.net/uploads/4529697/normal_5feaf4468c037.pdf
    • https://birivuben.weebly.com/uploads/1/3/4/6/134618962/5969786.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/donake/formative_assessment_feedback_template.pdf
    • https://s3.amazonaws.com/tomaxade/antimalarial_drugs_in_pregnancy.pdf
    • https://s3.amazonaws.com/xarojapi/blackheart_haven_veteran_guide.pdf
    • https://s3.amazonaws.com/divelatoxa/vupasuxefuledin.pdf
    • https://s3.amazonaws.com/xamibudasagas/hitachi_starboard_software_windows_7.pdf
    • https://s3.amazonaws.com/bidurudilidujug/transunion_form_to_request_credit_report.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108a1.bin
06db6db6418ba15111260d149d5ec3996d75349ca9ab08ee72ab17bc9b74c27f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 5676 bytes
font_01_sfnt_off00011bc8.bin
dfdbc644bfdfa99615b0f9715d116ea6af97dcec49082e8e7602c8ac6595824a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC8 10412 bytes

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