Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e5a7e410623282…

MALICIOUS

PDF

78.9 KB Created: 2021-06-03 14:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d5d214473010e50c340b226e847223f3 SHA-1: c86917d3a7ca7680b7cfd0fe079dd43c1aecfe0c SHA-256: 77e5a7e410623282cb684111ae28a3430ecdf28c46f26575f8737c409c7cb96a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains an external URI pointing to 'baarspo.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'real conditionals worksheet pdf'. No scripts were extracted, but the presence of external links and the high confidence detection indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/123?utm_term=real+conditionals+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458412/normal_60137f82a87b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465705/normal_60337ec137e47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409630/normal_600dc06d76fda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375077/normal_60032e1f310ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sovafiben.pbworks.com/f/vizio_65_inch_tv_manual.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/f/sobagorilalufaxaxewuf.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/f/how_is_benvolio_described_in_romeo_and_juliet.pdfIn PDF document text
    • http://noxiwako.pbworks.com/f/clean_master_apk_android_4.1.pdfIn PDF document text
    • http://palejemevat.pbworks.com/w/file/fetch/144512781/camino_al_minimalismo_gratis.pdfIn PDF document text
    • http://favixose.pbworks.com/w/file/fetch/144554190/58033629084.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/f/best_books_on_pakistan_history_in_urdu_free_download.pdfIn PDF document text
    • http://nowefuro.pbworks.com/w/file/fetch/144423057/lodomalomisotofilaroxaf.pdfIn PDF document text
    • http://fevosezew.pbworks.com/f/relanemodova.pdfIn PDF document text
    • http://wamotarirup.pbworks.com/f/gogimefukufaxog.pdfIn PDF document text
    • http://ropotupi.pbworks.com/f/how_to_pair_bose_700_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10337284-db9f-4f9d-bf9c-a70f2300f90e/penewasonimigogisovuveluz.pdfIn PDF document text
    • http://wufamazajo.pbworks.com/w/file/fetch/144465105/67713763677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56b3ac2b-5293-4459-b558-5270d02daea5/best_exercise_to_lose_weight_all_over_body.pdfIn PDF document text
    • http://pejuzor.pbworks.com/f/1292610893.pdfIn PDF document text
    • http://vananizi.pbworks.com/w/file/fetch/144497340/how_to_fill_epf_form_10c_online.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144411963/58717030802.pdfIn PDF document text
    • http://kuzimotum.pbworks.com/w/file/fetch/144531678/52255321282.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_off0000f5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 5404 bytes
SHA-256: bfdfa24c187378cf032fdf1e65135d5ce8877ebaf993d1ac57bdcff14fcad103
font_01_sfnt_off0001082c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082C 10636 bytes
SHA-256: 482eeaffa88a8960556b25ff7241e693a210c5472405f49b89dbfb2c9a048e06

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