Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8fef70e0190234…

MALICIOUS

PDF

104.2 KB Created: 2021-03-05 01:56:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 467e9142e880727b369046359b8162e8 SHA-1: 9946cd5e26b2cad90940456b9fee5fb6d4c9a3aa SHA-256: 1a8fef70e0190234e679913ebb8f188d97349be543202cacdc1ac84643849f47
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate this PDF is designed to host a large number of external links, likely for SEO poisoning or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=geronimo+stilton+book+2+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4456135/normal_6005e265d5bac.pdfIn PDF document text
    • http://puveputado.sportsontheweb.net/business_statistics_and_mathematics_b.com_part_1_notes.pdfIn PDF document text
    • http://kudopifupelixi.22web.org/bevudelokujoworisom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472501/normal_5fcf88fe9bb48.pdfIn PDF document text
    • http://leziwazedo.mypressonline.com/st_francis_retreat_house_easton_pa.pdfIn PDF document text
    • http://golixudib.mypressonline.com/69150988205.pdfIn PDF document text
    • http://lirinevewafa.mypressonline.com/razor_power_core_e200_weight_limit.pdfIn PDF document text
    • http://bigonetudukori.iblogger.org/46587039620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_601cb743bfe38.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/nuribu.pdfIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_84e25fd146504773ad0f8fe0959535de.pdf?index=trueIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_58e19501653d4d7bbd8386813390704b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/nuxiwukuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/stanford_machine_learning_coursera_quiz_answers.pdfIn PDF document text
    • http://robexekipojop.rf.gd/5_year_planning_calendar_template.pdfIn PDF document text
    • http://mibexalaxesu.epizy.com/medidas_de_block_de_concreto.pdfIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_0f8b5c66cda745619b44644250a527f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mokixetat/46875740488.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/set_bold_programmatically_android.pdfIn PDF document text
    • http://bekugasil.rf.gd/abominable_putridity_album.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/getabenow.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/missguided_pink_paperbag_trousers.pdfIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_ca2cad67342743a38aec21c7e25b3bc9.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000151eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151EB 5344 bytes
SHA-256: 427ef96b2264b674bec6db10e6f60ee0facebcdf3f5ddf43542aa10f3860135b
font_01_sfnt_off00016405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16405 15536 bytes
SHA-256: 02bcd2e6d2c474355650a5fe884c2264705e75231e5b5ae747ebb12f5618e0be

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