Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5c9aeb09c0468a…

MALICIOUS

PDF

74.7 KB Created: 2021-02-15 06:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a66156bacb8849cb091c695cf1015852 SHA-1: 5c3f7de3e89f6e7f9fd61986561b50c4a3df1381 SHA-256: 4e5c9aeb09c0468abacee2faf1bb1f4c7cdc519ae1e3b8222173718ac21e6239
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URIs. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of links, suggesting an attempt to direct users to potentially harmful content. While no scripts were extracted, the presence of multiple external URLs points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/aws?utm_term=bacillus+cereus+sintomas+pdf PDF link annotation
    • https://cdn.sqhk.co/bopibege/jjidwIJ/overkill_3_1._4._5_mod_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417212/normal_6021843f6e0c3.pdfIn PDF document text
    • https://cdn.sqhk.co/nosamese/ghXibhc/hello_cat_game_play_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425737/normal_5ff91fa0e81c8.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatagemi/j4Nmn27/touch_n_go_top_up_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495691/normal_6016233891042.pdfIn PDF document text
    • https://cdn.sqhk.co/fepogosu/ibie1hg/lose_belly_fat_workout_plan_at_home.pdfIn PDF document text
    • https://mamapesuwilataj.weebly.com/uploads/1/3/4/8/134857931/4aac6a602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_601b676070aee.pdfIn PDF document text
    • https://betutoza.weebly.com/uploads/1/3/4/8/134899773/61514a802d133c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/desenaz/trastornos_alimenticios_en_adolescentes.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/rerewanijebofibujiga.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/coulomb_damping.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/iphone_7_camera_app.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/88671108054.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/housing_benefit_overpayment_appeal_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/afterlight_apk_mod_full.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/basic_electronics_repair_guide.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_off0000e3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 5348 bytes
SHA-256: ce095ca7d9a69520bb24ee118ead864b0f2037f30deed7e4372a698c4812714b
font_01_sfnt_off0000f5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C1 11948 bytes
SHA-256: 18386debc33b3ce0f66ca3884c7a2ced11f252c4636e4540e7287288270774ff

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