Malicious PDF — malware analysis report

Static analysis result for SHA-256 30cf74f160c13418…

MALICIOUS

PDF

81.8 KB Created: 2021-03-23 06:43:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ae46960419ac7734dfad3cbb131a6f0 SHA-1: 716a77a1bb6297e5a7c9e50c6222751089177aa9 SHA-256: 30cf74f160c134188f10ec917b4d8b807fd82566ffbff765b542661e5c5b05f4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one pointing to 'seumenha.ru', suggesting a link farm or SEO abuse tactic. ClamAV and ML classifiers indicate malicious content, specifically identified as a phishing trojan. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-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://seumenha.ru/award?keyword=cashless+society+china+pdf
    • https://cdn-cms.f-static.net/uploads/4475866/normal_605945868ca21.pdf
    • https://cdn.sqhk.co/vorebilifi/bR2icja/xozawirazilo.pdf
    • https://cdn.sqhk.co/kekelivig/b5Ejhhz/the_legacy_report_jeff_clark.pdf
    • https://cdn-cms.f-static.net/uploads/4371787/normal_5fd2e40538323.pdf
    • https://static.s123-cdn-static.com/uploads/4470972/normal_60005e4af18c0.pdf
    • https://static.s123-cdn-static.com/uploads/4386089/normal_5ff81a363c0e2.pdf
    • https://cdn-cms.f-static.net/uploads/4459629/normal_5fd94ad8a3251.pdf
    • https://cdn-cms.f-static.net/uploads/4464301/normal_6057f88898aa2.pdf
    • https://cdn-cms.f-static.net/uploads/4489733/normal_60349795144d4.pdf
    • https://cdn-cms.f-static.net/uploads/4485435/normal_5fe9c45813b39.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/lomiwexuva/radeluluretedefuvaratenon.pdf
    • https://s3.amazonaws.com/bopuxosavubare/schaums_differential_equations_3rd_edition.pdf
    • https://uploads.strikinglycdn.com/files/77bbe94b-8bde-465f-a758-fc898cca32b6/liwafebirivipowew.pdf
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_abdbf48f41994efbbb6bba53f0b58ba8.pdf?index=true
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_b6ab771db04c4d7ab554a8bbfd191e13.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8b48b795-7ddd-4bb0-b6fe-26c83968fd13/66659342721.pdf
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_bf0a0f74601545a58089f0dcb2cb926e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/74825d3e-5a68-4543-ad78-1c249ce4f4bc/1448070404.pdf
    • https://uploads.strikinglycdn.com/files/77e38c4a-2af5-46d3-afd6-984562eb165e/information_technology_engineering_salary_in_india_per_month.pdf
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_346aa1108068488096cfcade10c2b0c9.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b2.bin
59a90c7201f6022ef94dbe8a27c432fca79be11d3df4982c1bf3cf37f827f8bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 5060 bytes
font_01_sfnt_off000102ec.bin
ec55846bdf67adf1bf892b63274d5973882e7e00167e6509d5978bee49816aed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 11740 bytes
font_02_sfnt_off00012a62.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A62 4324 bytes

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