Malicious PDF — malware analysis report

Static analysis result for SHA-256 2abc3e3a71086f71…

MALICIOUS

PDF

80.5 KB Created: 2021-03-18 21:54:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 425f992af303ac2d655546ff3f7831de SHA-1: b8a603ef8a500583a59af9bfa1c882ea26ec2d10 SHA-256: 2abc3e3a71086f7124399ba896246cf72262bcd0577069f7b90f785106fcf771
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, including one to 'maypoin.ru', suggests an attempt to redirect users to potentially malicious websites. ClamAV also identified it as Pdf.Phishing.Trojan. The document body is heavily obfuscated, but the overall structure and heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=nova+summer+2020+classes+cost
    • https://cdn-cms.f-static.net/uploads/4466376/normal_602eb6d2dc5ca.pdf
    • https://static.s123-cdn-static.com/uploads/4388613/normal_5fff2278efffb.pdf
    • http://nout-sale.site/bedumiviwisalomirojizawugenc.pdf
    • https://cdn-cms.f-static.net/uploads/4475586/normal_604776680774c.pdf
    • http://cookwellbakewell.com/applications_of_partial_differential_equations_in_real_lifegswnj.pdf
    • https://cdn-cms.f-static.net/uploads/4421627/normal_601c78c001554.pdf
    • https://cdn-cms.f-static.net/uploads/4444884/normal_60421e21774a5.pdf
    • https://cdn-cms.f-static.net/uploads/4388174/normal_601329cd31451.pdf
    • http://digitalmedialit.com/xuzire79ksl.pdf
    • https://static.s123-cdn-static.com/uploads/4389616/normal_5ff370aab59e2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/pazovugal/2007_toyota_avalon_shop_manual.pdf
    • https://s3.amazonaws.com/fulazelof/tapevipuwibigirufojeb.pdf
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_36e36c1f05e5495099384e7852edaf81.pdf?index=true
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_bf48b0b8d22b45ff94b42bd1eef93161.pdf?index=true
    • https://s3.amazonaws.com/lawakux/fefufonapu.pdf
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_bd29ddfbef9c4907b4a6e323a1b6d6d4.pdf?index=true
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_d7ea8b3711b64e228575a8611f9832e3.pdf?index=true
    • https://s3.amazonaws.com/dopugaxelelema/the_revenant_hindi_movie_download_filmyzilla.pdf
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_783d3785a56648749db7fa1a7a663f5e.pdf?index=true
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_369abe0eb5f8484fa3eea3a0d8aa34fb.pdf?index=true
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_63b786007a5c404bba4a07ed9573b7fa.pdf?index=true
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_e1fa760bbe96479aa1289d9552315df0.pdf?index=true
    • https://s3.amazonaws.com/kobivimelelo/2003_dodge_durango_slt_engine_4.7l_v8.pdf
    • 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_off0000ec88.bin
e61009d2ac4a917ce4bce9f54824f545f57994af5894bbc4f07930244945347d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 4976 bytes
font_01_sfnt_off0000fd85.bin
9dadc8aa6c2a430d5fd84ca4577396bfceb40f02bb1f10caaa0dc3f0bdc9b849		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD85 11612 bytes
font_02_sfnt_off00012509.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12509 4324 bytes

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