Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6876607fcdb43f…

MALICIOUS

PDF

89.5 KB Created: 2021-03-17 21:03:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 23f7d6f4e5673abae6c9af79bf428aa7 SHA-1: 749288bacbc81acf7c754b809e4d27625c963cb2 SHA-256: 1a6876607fcdb43fc424dfda36aabcd5e6daf22b0a78962fff4af8c56e3efa6e
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 0.9989

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://kuzutuzo.ru/wix?keyword=los+callejones+los+angeles+directions PDF link annotation
    • http://freehookup.xyz/ac_joint_injury_exercises_nhsi9ods.pdfIn PDF document text
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/6292428.pdfIn PDF document text
    • http://wisatemubudu.medianewsonline.com/how_to_reset_verizon_fios_g3100_router.pdfIn PDF document text
    • https://kivojiwivumupu.weebly.com/uploads/1/3/4/5/134597008/sasenugus.pdfIn PDF document text
    • https://sexuviruzimi.weebly.com/uploads/1/3/2/8/132814305/sixijokutapugix_wafugavawen_joxizafojebi_xibarejudemavu.pdfIn PDF document text
    • https://xisuludibu.weebly.com/uploads/1/3/5/3/135300694/duperodoso_puwufelu.pdfIn PDF document text
    • http://erogan-columbia.site/best_general_biology_textbookge0u4.pdfIn PDF document text
    • http://xasedogamif.mypressonline.com/la_anemia_en_nios.pdfIn PDF document text
    • https://xitosuwoga.weebly.com/uploads/1/3/3/9/133988858/dames.pdfIn PDF document text
    • https://loxogekero.weebly.com/uploads/1/3/4/0/134040689/wekinagutujor_dikixa.pdfIn PDF document text
    • http://fruit-ital.space/2017_federal_w_4_withholding_formwlqe4.pdfIn PDF document text
    • https://kesupegujofoju.weebly.com/uploads/1/3/5/3/135388852/xogikag.pdfIn PDF document text
    • http://waranijovuv.sportsontheweb.net/talend_big_data_tutorial.pdfIn PDF document text
    • https://tizevilujiv.weebly.com/uploads/1/3/1/4/131406709/338199.pdfIn PDF document text
    • http://byt-upak.ru/what_fuel_does_a_briggs_and_stratton_450_series_take940tk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_3e205f14bbaa438585287b04d3df51e2.pdf?index=trueIn PDF document text
    • http://gevegure.rf.gd/lurin.pdfIn PDF document text
    • http://wewefaxekedafoz.epizy.com/android_version_7.pdfIn PDF document text
    • http://wepinipinalojud.epizy.com/4627654046.pdfIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_bc6ebd0ae19b4cdcb06c747134237746.pdf?index=trueIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_5ad56b206e9247a8be45989d38df8315.pdf?index=trueIn PDF document text
    • http://rodedewezijore.atwebpages.com/can_you_connect_night_owl_to_wifi.pdfIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_c3be0e474856427b809589be77fc11dc.pdf?index=trueIn PDF document text
    • http://jujuletofu.onlinewebshop.net/cantares_mexicanos_libro.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D8 4912 bytes
SHA-256: 46698541792df44cb90341740fec37b9f24e907352eafce1bafa571db2d16985
font_01_sfnt_off00012195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12195 11872 bytes
SHA-256: c1857a6794cdd114fc89ad73f45275839e95250698f68986c69a9aba70646414
font_02_sfnt_off000149f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f