Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb62c34c84a94f8…

MALICIOUS

PDF

81.1 KB Created: 2021-03-14 17:25:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0a48376e42fa7929f59f68484a148448 SHA-1: dc24d428e2d74bcf4aff2bf8b4d2fe48b4f56e6b SHA-256: cdb62c34c84a94f8109096469f6fc108ed4424a8ed8aac2f1bea387a2978cc7d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spamming operation. The embedded URLs likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/wix?keyword=different+forms+of+the+same+gene PDF link annotation
    • https://jarovoxo.weebly.com/uploads/1/3/4/5/134511136/bupej.pdfIn PDF document text
    • https://rifakinuzofu.weebly.com/uploads/1/3/0/8/130815009/3235402.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373782/normal_60343d3e5439b.pdfIn PDF document text
    • https://zidajikivumab.weebly.com/uploads/1/3/4/6/134625594/468649.pdfIn PDF document text
    • https://rinafudafize.weebly.com/uploads/1/3/5/2/135293322/3ce01757abd.pdfIn PDF document text
    • http://servicesforsupport.com/ubiquiti_loco_m2_firmwarewtdhu.pdfIn PDF document text
    • http://fullpisetc.ru/firumafabosubibosepopujh2yu.pdfIn PDF document text
    • https://wufisosudima.weebly.com/uploads/1/3/0/8/130874090/dedubaxe.pdfIn PDF document text
    • https://pibiwija.weebly.com/uploads/1/3/4/8/134896476/vikod.pdfIn PDF document text
    • http://i-men.ru/ubuntu_16.04_free_download_for_laptopu6ypg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446636/normal_6033819b9b710.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373281/normal_5fcbc5ce590c2.pdfIn PDF document text
    • http://spencermcman.us/dell_b2375dnf_printer_driver5m11c.pdfIn PDF document text
    • https://vujajewuriwox.weebly.com/uploads/1/3/5/3/135387523/1906218.pdfIn PDF document text
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/sasutuwepajo_muwizavene_patonokulajomo_vazepotewotoko.pdfIn PDF document text
    • http://ejinaya.com/fluke_linkrunner_at_2000_fiber_testxodv9.pdfIn PDF document text
    • http://loveantravel.xyz/video_karaoke_bandungank3mqp.pdfIn PDF document text
    • http://bestsalestoday.xyz/manual_de_sealetica_mspjzsau.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381766/normal_5fff688aec019.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/5821405.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/06b870b8-024d-404a-8902-3f7ef6f417c5/memowaxexolunopilarugupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c47202c8-5a73-4e6e-b2ef-df559fb02286/54867104733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3115d536-3236-45e0-8d67-e34a70756102/sir_gawain_and_the_green_knight_part_3_and_4_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e3c0f50-cb28-4d14-9e36-01c23a9f9f2a/whirlpool_self_cleaning_water_cooler_not_working.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_off0000f975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 5148 bytes
SHA-256: 9c10a32453393c71fb806c861b5db1d8941789b9a3901eccd93cc3406bb2fd50
font_01_sfnt_off00010ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD6 12948 bytes
SHA-256: 1b7d3851453ff576bf1b5471b63e7d73f6bcd0562edf34d7b3f0e1e0de08f93d