Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb786ab93fe553fe…

MALICIOUS

PDF

75.1 KB Created: 2021-04-24 07:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ee7e8c8b315d20c0332e67217d43fdec SHA-1: 1290aa22e5d355b54b6a07b013be545cffb293ef SHA-256: fb786ab93fe553fe84c165d7016e0bde7320580e2d8c4625923def4810b83271
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=garmin+drivesmart+50+battery+replacement PDF link annotation
    • http://indonesia2health.online/865299767734cd9w.pdfIn PDF document text
    • http://legendnat.space/labinisi2bj.pdfIn PDF document text
    • http://timecodes.net/how_to_find_mean_and_standard_deviation_on_casio_fx-115es_plusvs17d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_603aa5efc1923.pdfIn PDF document text
    • http://nusorogexirexi.22web.org/4358135428.pdfIn PDF document text
    • http://trendmobile.ru/what_is_the_difference_between_an_llc_and_a_subchapter_s_corporation0v7w3.pdfIn PDF document text
    • http://zonuvak.medianewsonline.com/kujedajulatowo.pdfIn PDF document text
    • http://rutesizopokire.iblogger.org/gurafimozopadijiposibobo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450244/normal_5fda2bdb49373.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/roluniwimazizo.pdfIn PDF document text
    • http://lalevuw.mypressonline.com/ccsk_v4_exam_questions.pdfIn PDF document text
    • http://menbp.online/76996719867yw777.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jinoremer.rf.gd/47432247206.pdfIn PDF document text
    • http://migipezerur.epizy.com/dovoxosekojilulu.pdfIn PDF document text
    • http://kuporalegumema.epizy.com/alaipayuthey_full_movie_tamilrockers._gs.pdfIn PDF document text
    • http://zatojigetafugud.epizy.com/zogutamovo.pdfIn PDF document text
    • http://xibubew.epizy.com/miwinigatuz.pdfIn PDF document text
    • http://kudelonibuwulaj.rf.gd/entrepreneurship_education_in_secondary_schools.pdfIn PDF document text
    • http://patudesaruvob.atwebpages.com/asthma_action_plan_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_off0000e607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 5816 bytes
SHA-256: bd5bbe3d96bc7fa44c9667a8318b007652b8b29e3d8c1fae07f005e93f5aa752
font_01_sfnt_off0000f9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C9 10796 bytes
SHA-256: 5f3879724eed1bae2c298ebebd87fa912721b8ebe189455c3f3b28c82640bd17