Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7186c522ccc1c23…

MALICIOUS

PDF

84.1 KB Created: 2021-02-03 02:51:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9ac60843fb356b745268d77f40e4c404 SHA-1: 8fc36476d90a03e6c9a23f47ad2a03f94047b43b SHA-256: c7186c522ccc1c2346d67c3e8aad631323f12ab1cd7af7f89388c6fb9976fd83
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/aws?utm_term=javascript+android+app+tutorial PDF link annotation
    • http://wulodab.iblogger.org/bacon_lettuce_tomato_sandwich_nutrition_information.pdfIn PDF document text
    • http://wowuzarupi.iblogger.org/95264124892.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472774/normal_5ffc31597a5ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393189/normal_60192aac6ee62.pdfIn PDF document text
    • http://lowafax.22web.org/vojiwesede.pdfIn PDF document text
    • http://lovumodezubudem.iblogger.org/chori_chori_movie_video_song.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wubezitapafa.epizy.com/saxolaxori.pdfIn PDF document text
    • http://pigasupozev.epizy.com/povoj.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/fgo_halloween_event_2017_guide.pdfIn PDF document text
    • http://pojasiw.rf.gd/fraction_addition_worksheets_with_answers.pdfIn PDF document text
    • http://furofazitogo.epizy.com/84294688183.pdfIn PDF document text
    • http://pejonoma.epizy.com/aloha_soft_bamboo_sheets.pdfIn PDF document text
    • http://biborufa.epizy.com/90447098147.pdfIn PDF document text
    • http://towupew.epizy.com/itunes_for_windows_64_bits_10._1.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/13977993019.pdfIn PDF document text
    • http://ribibepope.epizy.com/19640252019.pdfIn PDF document text
    • http://zudozam.epizy.com/charlie_2015_malayalam_film_movie.pdfIn PDF document text
    • http://zuzitubop.rf.gd/jujuvapavewejubu.pdfIn PDF document text
    • http://xadebomuf.rf.gd/kaposi_varicelliform_eruption_vs_eczema_herpeticum.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_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 5116 bytes
SHA-256: 4f996b8cd11464479d532d3a2d1cefdf95eb2e0cfa2f720020662df8a07bc1f5
font_01_sfnt_off000113f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F3 14608 bytes
SHA-256: fc86dd36699375446db5fa15caeb2f0c67d01c2d0595bc81792489ec3d717e92