Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a01916f12b06c4…

MALICIOUS

PDF

95.8 KB Created: 2021-03-19 05:02:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9b8bef1a3d01abb2e9d2e320c917c49e SHA-1: b15dba286d8e3e02de5dbb32a703e7ac182f83a9 SHA-256: 42a01916f12b06c463613929697678a52fd7a62f5bcad21ca1de6a9b1d1c15a0
186 Risk Score

Malware Insights

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

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 0.9988

Heuristics 6

  • 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 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://baarspo.ru/aws?utm_term=4th+grade+math+standards PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425921/normal_600badbc29e5d.pdfIn PDF document text
    • http://jegotaraxipux.iblogger.org/konsep_askep_bronkopneumonia.pdfIn PDF document text
    • https://donurufeto.weebly.com/uploads/1/3/4/8/134898164/valev.pdfIn PDF document text
    • https://nolemidu.weebly.com/uploads/1/3/4/5/134584078/6041552.pdfIn PDF document text
    • http://xirapanagix.getenjoyment.net/algorithme_de_tri_par_selection.pdfIn PDF document text
    • http://doporem.22web.org/ice_current_affairs_january_to_august_2020_download.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/the_curse_of_strahd_ddo.pdfIn PDF document text
    • http://modozadubop.mywebcommunity.org/all_quiet_on_the_western_front_book_download.pdfIn PDF document text
    • https://lexikusu.weebly.com/uploads/1/3/1/4/131438729/moxofuziruxagejajede.pdfIn PDF document text
    • http://xoxunanodu.22web.org/durga_saptashati_archive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_6018dc1f2a27f.pdfIn PDF document text
    • https://mukojemugasab.weebly.com/uploads/1/3/5/3/135314074/949cc906.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/9104137034.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_8c859ad0befb4a98a1aae08135d4de08.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/meludav/51789764687.pdfIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_2cff599d62ba4351a6495eb632f25100.pdf?index=trueIn PDF document text
    • https://fefcf4f0-bf52-4086-adb3-b788df03f7bd.filesusr.com/ugd/da9d4c_40510b18bbfc4ef7b7af336a2bffa79b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tawovojo/35965153639.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/91221867933.pdfIn PDF document text
    • http://kinowazekuponaw.rf.gd/piwedalawusaxuzosolewuki.pdfIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_e7aaea991b3c4c5a83d4e0f7157c2555.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mutirexa/apk_bee_movie_apkpure.pdfIn PDF document text
    • http://kutoxinupuroxo.onlinewebshop.net/5865499368.pdfIn PDF document text
    • http://fuguduvuduwir.epizy.com/important_synonyms_and_antonyms_download.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_off0001259d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259D 5200 bytes
SHA-256: a498d49fdae63d98935bc5127ec3d7c1f45df16ef497ce97861d8d5afba57ccd
font_01_sfnt_off00013721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13721 10676 bytes
SHA-256: 53bd24316d16b16ab03dbc2ab354a12dae0e14f1cbb30c9cf35353dc7dce05b4
font_02_sfnt_off00015c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C03 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15