Malicious PDF — malware analysis report

Static analysis result for SHA-256 c295b544d7531a0e…

MALICIOUS

PDF

78.0 KB Created: 2021-03-15 10:51:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcffaeac1c3df665dde4f6959be3664d SHA-1: 501d6f0fdb6add2db23187d6d2fb8b7d2dbf730a SHA-256: c295b544d7531a0e8e376187a9e1f7a0c1c07a1f858d3696724af3db66a02f69
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to PDFs hosted on Weebly, suggesting a link farm or SEO abuse tactic. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common method to bypass gateway security. While no scripts were explicitly extracted, the PDF structure and external links suggest a potential for further malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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
  • 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://kuzutuzo.ru/wix?keyword=region+9+texas+high+school+rodeo+forms
    • https://vavaterojitenoj.weebly.com/uploads/1/3/4/8/134898986/9113413.pdf
    • https://lubefapezixa.weebly.com/uploads/1/3/1/3/131398117/8529433.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_bf9c551bb1d8462aa1afcf3d3c8a437f.pdf?index=true
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_0394710f79474d04b2f6bd1136b629ab.pdf?index=true
    • https://uploads.strikinglycdn.com/files/78647c93-0329-45a5-8f8d-4379126af5ce/graphic_design_portfolio_inspiration.pdf
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_693eb88c6962479aa2d470204e3ff8fb.pdf?index=true
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_e255465e710f41a1885800161b4eb677.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ccb0b3fa-9c0f-403c-be8b-b7133d20a07c/digewovuloko.pdf
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_c31b7b0a70c844f189e8347902016fef.pdf?index=true
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_2c9a5c779a0f4a41a96f0f10febb19f1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fc3ac598-8c4b-4e37-8734-02cef9242093/37169462500.pdf
    • https://1ba6f066-89d4-4445-b8a9-08a6de046ef2.filesusr.com/ugd/d40554_31961d3ecd0845bf9d572f0fd729b700.pdf?index=true
    • https://s3.amazonaws.com/napejaxosinages/investigational_drug_data_sheet.pdf
    • https://s3.amazonaws.com/sukobogixe/notuwukagejufuje.pdf
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_8e64569d5c904ffb848ab36ea7537e63.pdf?index=true
    • https://uploads.strikinglycdn.com/files/caa07cd5-c87b-42c0-bd2a-f4694d0e2298/altec_lansing_mini_lifejacket_jolt_mount.pdf
    • https://s3.amazonaws.com/bupaxomu/emploi_t_canada_2019_guide.pdf
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_cd2955e8b69645f4aa460f7b19ffa0bf.pdf?index=true
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_03e947b0cc77448bbd7febac86b53ae0.pdf?index=true
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_c326de5b027b4a1fbce240378a4f4b4f.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_off0000ed03.bin
d40a65918e50a46c1336faa4f41428718427b7c30431189b73a0ba43c261cb16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 5668 bytes
font_01_sfnt_off0001002f.bin
1d1485323b215a50ad3160f9ba65365cc869fae6db6d3d777381b4494b3f240c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 12856 bytes

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