Malicious PDF — malware analysis report

Static analysis result for SHA-256 834dca020abd1c38…

MALICIOUS

PDF

79.6 KB Created: 2021-06-10 19:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 87fb099bcbc0453696f758e999a6e0ba SHA-1: 3d150787f44757a97587f4b36692022e031e855d SHA-256: 834dca020abd1c38a75c1a5ecdcd4c97ebac3b586edc47cbe97956a91b4fbc0f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://wastran.ru/pbw?utm_term=homework+1+angles+of+polygons+answer+key PDF link annotation
    • https://fotobuwab.weebly.com/uploads/1/3/4/3/134368258/ed2b95cb7ef6c7.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4388426/normal_60b0f61d7b55c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4454167/normal_60b04de3da83e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450337/normal_602edca903a7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420767/normal_60074ef0b3897.pdfIn PDF document text
    • https://gunosevibo.weebly.com/uploads/1/3/4/7/134716368/4698457.pdfIn PDF document text
    • https://dadajiwo.weebly.com/uploads/1/3/4/8/134881642/fupenufimibeziraf.pdfIn PDF document text
    • https://kinigapiluxuke.weebly.com/uploads/1/3/4/8/134863840/pomidi.pdfIn PDF document text
    • https://zudizobi.weebly.com/uploads/1/3/4/8/134860565/keduxelolebuvuva.pdfIn PDF document text
    • https://popezerimev.weebly.com/uploads/1/3/4/5/134514232/lefeva.pdfIn PDF document text
    • https://lipixebuz.weebly.com/uploads/1/3/0/7/130740586/c9de8.pdfIn PDF document text
    • https://ruparowix.weebly.com/uploads/1/3/4/3/134350000/dorer.pdfIn PDF document text
    • https://menelaxewo.weebly.com/uploads/1/3/4/3/134362368/xufuwowexapuxikevepe.pdfIn PDF document text
    • https://fulotetaputu.weebly.com/uploads/1/3/2/7/132740707/7fb594d50cebeba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489976/normal_6041d3d0a4582.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d9005f4-f7ec-43fe-b407-f466e8fb5d5f/what_is_direct_linear_plot.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/wupapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d5a0fb6-799a-4e80-bf53-7ebb3f56c6ab/fallout_4_mods_not_working_vortex.pdfIn PDF document text
    • http://liralafum.pbworks.com/w/file/fetch/144935529/app_center_war_robot_test_server.pdfIn PDF document text
    • http://padimagofo.pbworks.com/w/file/fetch/144477963/descargar_lista_de_hechizos_de_harry_potter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2031e836-fea7-4d18-bcdc-237ba3a333e0/ruger_lcp_ii_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff76deb5-4cc4-4890-83f7-aaf0d43bfe47/brother_jx1420_sewing_machine_manual.pdfIn PDF document text
    • http://wixugigir.pbworks.com/f/ram_leela_full_movie_with_english_subtitles_free.pdfIn PDF document text
    • http://garewewaziwu.pbworks.com/w/file/fetch/144538740/gram_positive_cocci_bacteria_antibiotics.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 5492 bytes
SHA-256: 823c7311e0e0728f871afd6f2e4eae6a17ad63502fecbacb00f94033c579f45e
font_01_sfnt_off0000f444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF444 11368 bytes
SHA-256: 35d7257a0bb3366abffa87be8a89e0f51ce997c10c9603dbd5d2fa5b9b64e30c
font_02_sfnt_off00011b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B38 16072 bytes
SHA-256: 062f8a7185608a18dbd56baf48eb14c791e3c6ea8866a2ddd6a03467109098f1

Open this report in the interactive analyzer, or submit your own file for analysis.