Malicious PDF — malware analysis report

Static analysis result for SHA-256 156c95d93e84407a…

MALICIOUS

PDF

102.8 KB Created: 2021-03-01 06:36:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b9dcc0fec7d4b3bd4ce9288e571bcaf6 SHA-1: d87c307d982bdd41716ee5b6cb8bd0d82070f626 SHA-256: 156c95d93e84407a979e9be45ba5939eb04218714c629eca37335e6f1a4c0362
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to attract traffic or distribute malicious files. The heuristic 'SE_SECURITY_BYPASS' indicates the document attempts to instruct the user to disable security software, a common tactic in malicious documents. While no scripts were directly extracted, the presence of numerous external URLs and the security bypass instruction strongly suggest an intent to download and execute further payloads, likely leveraging embedded JavaScript or other exploit vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://dugedepap.ru/award?keyword=shia+quran+with+urdu+translation+pdf+download PDF link annotation
    • https://sevimuxeso.weebly.com/uploads/1/3/0/7/130739978/xuzutese.pdfIn PDF document text
    • http://leree6.club/c_v_format_for_job_applicationkzdro.pdfIn PDF document text
    • https://fezowekufeda.weebly.com/uploads/1/3/3/9/133999429/2691601.pdfIn PDF document text
    • http://golden-charm.ru/lifadoboxitufot0737.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/fn5khhh/dune_buggy_las_vegas_groupon.pdfIn PDF document text
    • http://dfds.in/teluwokogisarq4m18.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/Xqns8bU/s_chand_physics_class_9_chapter_2_notes.pdfIn PDF document text
    • http://clientesdkb.com/93587149054uok8j.pdfIn PDF document text
    • https://cdn.sqhk.co/puwetudul/VOcgchi/fazeretadaparalidijeme.pdfIn PDF document text
    • http://domsale.xyz/nodesidagajebofegiduah9zx.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/exogenesis_muse_piano_sheetmq8m4.pdfIn PDF document text
    • http://storeeuro.info/43673728396mfwh4.pdfIn PDF document text
    • http://oneplusonemain.xyz/la_vida_precoz_y_breve_de_sabina_rivas_pelicula_completa_repelisgrkbc.pdfIn PDF document text
    • http://thecabinets.xyz/put_on_the_full_armor_of_god_esv4zl0s.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugewameru/hhjijjR/kiwal.pdfIn PDF document text
    • https://jalaxogazumin.weebly.com/uploads/1/3/4/3/134373329/nonesamijix-jozajiburuka-mupazipafofemi-bogowana.pdfIn PDF document text
    • http://shop-kid-toys.online/srimad_bhagavata_puranaz8to4.pdfIn PDF document text
    • https://cdn.sqhk.co/jumivosokigo/ezpb4gh/bajiwage.pdfIn PDF document text
    • https://vimavaduziwali.weebly.com/uploads/1/3/1/8/131856569/f01659f994c7f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000154c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154C7 5452 bytes
SHA-256: 991d4dffacca2b63e57e0950c9ea01681d9d8ed8c427c7e1e90c3c25bcd68f6c
font_01_sfnt_off00016754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16754 11104 bytes
SHA-256: bdd5eac70b2bbaf1db7b67b06c6e38e4b8d819cab7cce9eba2ae087697f72c32