Malicious PDF — malware analysis report

Static analysis result for SHA-256 a244bf3b4e3d2c0a…

MALICIOUS

PDF

74.3 KB Created: 2021-03-09 19:50:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 688a100b880fccacfb7bf342a5c00a75 SHA-1: 5cf726813ddc49ac569805dfddc3415daaafeff1 SHA-256: a244bf3b4e3d2c0a6d7eb4885aea8b469bd91b8f14864059e9d07fb6528679c2
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 0.9991

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://maypoin.ru/123?utm_term=lit+review+matrix+template PDF link annotation
    • http://semarogejej.iblogger.org/why_is_my_dyson_hair_dryer_blinking_red.pdfIn PDF document text
    • http://itdiscount.pro/how_to_make_a_copper_moonshine_still7889i.pdfIn PDF document text
    • http://agnewjacobs.com/zeloraduruguzejimiwemudh8u3q.pdfIn PDF document text
    • http://nisiwitas.22web.org/2005_jeep_grand_cherokee_limited_5.7_hemi_horsepower.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/wipazu3z1l.pdfIn PDF document text
    • https://zirilomeme.weebly.com/uploads/1/3/6/0/136025267/2479417.pdfIn PDF document text
    • https://bejetatibuket.weebly.com/uploads/1/3/5/9/135957672/zolibakugupujiva.pdfIn PDF document text
    • https://zoxujaratufopa.weebly.com/uploads/1/3/5/3/135399722/vipobigine.pdfIn PDF document text
    • http://agent-spv.space/ski_garmisch_partenkirchen_snow_reporta1c29.pdfIn PDF document text
    • http://vomenelavive.22web.org/anitra_s_dance_piano_free_sheet_music.pdfIn PDF document text
    • https://gegivibubijob.weebly.com/uploads/1/3/4/5/134507206/lemaxoxozalavizoliga.pdfIn PDF document text
    • http://useraisins.pro/gps_compass_appq3cp1.pdfIn PDF document text
    • http://weporobedamebu.22web.org/43325543937.pdfIn PDF document text
    • http://axacheat4.xyz/how_to_fix_brother_printer_not_turning_on1dyyu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mejados/30728757774.pdfIn PDF document text
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_fd94956cbb81463e93e54ca3584e76bc.pdf?index=trueIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_287cdd39b9dd4341bf3137a27e8d4b25.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_6b66538286a5497c8b1f963934281365.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pasawe/pec_exam_result_2018_marksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/81417993527.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/kit_de_nettoyage_swiffer_wetjet_wood.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/powadomazoturigalojasus.pdfIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_03e2550f4f1e4b1390269ba2472899a9.pdf?index=trueIn PDF document text
    • http://fewepenemowa.epizy.com/weekly_planner_template_2020.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_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 4948 bytes
SHA-256: 4c0055029046d0041fefa5bf7ed8e3cfeb67cbe0714e87fc282341203092b577
font_01_sfnt_off0000f852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 10372 bytes
SHA-256: 292ffaaafdc6123fc1a28d8bd5868dd0cf58dcd1fcff887c864ce5d5fd845cda