Malicious PDF — malware analysis report

Static analysis result for SHA-256 458057e9a429c848…

MALICIOUS

PDF

315.3 KB Created: 2021-04-09 02:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4b257849a9d6bd48ee894d9ab859e5d3 SHA-1: bd297597da29afdd8a4e1230380268c28a0b207b SHA-256: 458057e9a429c84834f9232a432d49e6578a02e9d251aaca6cb803823e1d040b
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'baarspo.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/strik?utm_term=supernatural+castiel+death+season+12 PDF link annotation
    • http://jarobadut.22web.org/xumavakaritevizawefawu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413016/normal_5ff91dde539bb.pdfIn PDF document text
    • http://kibidusivojigo.iblogger.org/nios_dled_assignment_front_page.pdfIn PDF document text
    • http://tamarone.22web.org/bevacizumab_side_effects.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478133/normal_600c02c76dcf4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f71eef-1fbf-44e8-895e-79fccc1860c2/what_kind_of_jobs_can_you_get_with_a_management_degree.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/vuwozumoduxabavidufiv.pdfIn PDF document text
    • http://zamoguwudegovo.rf.gd/guide_to_intermittent_fasting_book.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/what_is_the_major_difference_between_program_management_and_multiple_project_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/323fe48f-7b03-4c8c-8893-3790ccf0e56c/607350038.pdfIn PDF document text
    • http://tuzotulerijenej.rf.gd/how_do_i_test_my_first_alert_carbon_monoxide_alarm.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/apptoko_clash_of_clans_mod_apk.pdfIn PDF document text
    • http://jugofave.rf.gd/99296433446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1228f88a-065c-4a02-ac0e-2a20238e018f/kegize.pdfIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_7db03f76d21f4d8eb91bf91a95376aef.pdf?index=trueIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_b91130d3b06b42d18c8d42c3deb79a81.pdf?index=trueIn PDF document text
    • http://pamajaxa.epizy.com/ge_wireless_door_chime_19297.pdfIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_a3b14319102746c99ae9ce5d1161f41a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/60f5ec2d-4892-4424-b918-7485f43f1e7b/what_does_all_good_wishes_mean.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_off0004a637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A637 5448 bytes
SHA-256: 17ca5d3ca63a0636b26d35535f03b9a9339786af9a9450760138f2af6242f7cc
font_01_sfnt_off0004b8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B8B4 11168 bytes
SHA-256: c546c65baa47ddbbf030a11a41b198315aadd385501aaacc5eef2fd4d7f81c63

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