Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4c4add749a0f09…

MALICIOUS

PDF

77.5 KB Created: 2021-03-05 04:48:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4976e1cb70c5b0c8651255fd9b52a0f SHA-1: 492c292d196be151d0cce51bf672ade8bc65b1e4 SHA-256: 7b4c4add749a0f09317d62a5b5a0b4ea0495d6b639d6b36d27a0512cf28bd086
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, including a known malicious redirector and a link farm, indicating an attempt to direct users to potentially harmful websites. The presence of a password-protected archive lure suggests an effort to bypass security controls. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://yafferge.ru/strik?utm_term=hunger+games+catching+fire+cast+district+7
    • http://bamefidev.mygamesonline.org/saxon_math_course_1_practice_test.pdf
    • https://cdn.sqhk.co/nukusigemug/jjcijgi/tdx_tower_defense_extremes.pdf
    • http://vozivovog.scienceontheweb.net/zedobo.pdf
    • http://faripofijukevom.mywebcommunity.org/what_is_contrast_in_art_definition.pdf
    • https://cdn.sqhk.co/vimerokil/4iebhaf/hyrule_warriors_age_of_calamity_confirmed_characters.pdf
    • https://cdn.sqhk.co/sategexarom/hrjfSgd/laralexu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lorerexeg/jenajojowan.pdf
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_4e0bb57fc331467aa8b040e38d2a0705.pdf?index=true
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_61397b20b9094889b61761488241a4a9.pdf?index=true
    • https://s3.amazonaws.com/zeworibuzoza/password_google_sheets.pdf
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_76da398e3be54c608ea9d7700c744efe.pdf?index=true
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_7d6cda634126491bbed169e49fb73232.pdf?index=true
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_0402dd421951451d95f828b12392c40b.pdf?index=true
    • https://s3.amazonaws.com/rekorewexidiwo/free_kindle_app_for_windows_10.pdf
    • https://s3.amazonaws.com/megujobemegor/34812907742.pdf
    • https://s3.amazonaws.com/tupofelasujewas/navy_designation_letter_template.pdf
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_a7e950359c004022acd2b9528974874d.pdf?index=true
    • https://s3.amazonaws.com/bulozor/47386835355.pdf
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_10866003e6874ead8e371edf729dbca9.pdf?index=true
    • https://s3.amazonaws.com/nolarifaforuxop/free_manager_64_bit.pdf
    • https://s3.amazonaws.com/duzexefemosaxe/lizefuretoso.pdf
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_b3f2e88459754ce296b6282542d3ac6b.pdf?index=true
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_4e6e244864a14af9bf690a6b840848e4.pdf?index=true
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_6cb575def7f64cb895940f03c3360931.pdf?index=true
    • 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_off0000f328.bin
24925d0ef2e0748a849526ab8babebae2cf7a5b211ddcad43ad193a974493926		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 5444 bytes
font_01_sfnt_off0001058c.bin
39deb7ba9d64d5ca693a57fa2d74ca579bb6d42197471829a3587f2c540f3ffb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1058C 10220 bytes

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