Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb543d9a25b8f5d1…

MALICIOUS

PDF

76.9 KB Created: 2021-05-25 02:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 19ee052b7138c16690dc9c1832b0a6be SHA-1: 8d06ea85b9f12bf1496384da58fe23791ff5b662 SHA-256: fb543d9a25b8f5d1c32b0cbbca4fc71539d1cb1d67bfd1e969b502578cfcb2f7
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=2-6+break+even+analysis+worksheet+answers PDF link annotation
    • https://gikoberi.weebly.com/uploads/1/3/0/9/130969260/vunafezirebojokeku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379982/normal_5ff94fb246872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443362/normal_60323cc1278b7.pdfIn PDF document text
    • https://nizufijaduwetep.weebly.com/uploads/1/3/5/3/135309937/6452657.pdfIn PDF document text
    • https://limuvowefegepud.weebly.com/uploads/1/3/4/5/134509231/vefogisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498330/normal_603723029d0d9.pdfIn PDF document text
    • https://wixokaregojes.weebly.com/uploads/1/3/2/6/132681478/debuzoxuwo.pdfIn PDF document text
    • https://tozakewa.weebly.com/uploads/1/3/5/3/135398337/lavuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384644/normal_6019bf2b0ae96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380090/normal_6039183230bf5.pdfIn PDF document text
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/552253.pdfIn PDF document text
    • https://garevanixuxud.weebly.com/uploads/1/3/4/3/134371644/rowupogadaf-ragaledu-sizimabulinaf-melisagobig.pdfIn PDF document text
    • https://mawijazug.weebly.com/uploads/1/3/1/3/131380733/rudefe.pdfIn PDF document text
    • https://zuverikaniwofu.weebly.com/uploads/1/3/4/1/134108987/kemupituxowejanu.pdfIn PDF document text
    • https://wozukaziximuru.weebly.com/uploads/1/3/4/5/134587045/lowago-belubot-bowix-wimunudome.pdfIn PDF document text
    • https://banafovogakake.weebly.com/uploads/1/3/5/3/135326552/xepawixafewaben_newunaros.pdfIn PDF document text
    • https://nukivobiwej.weebly.com/uploads/1/3/4/0/134016752/6809da052a1d6.pdfIn PDF document text
    • https://dotawipe.weebly.com/uploads/1/3/5/3/135323210/f926a.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/37acf315-3375-4380-a8a2-73b43b553fed/binh_php_tn_t_v_36_mu_k_tp_37.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3e4b93a-d564-4cfb-8576-ac81eae10519/zilozadutomozidoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66779901-1fe1-4cc0-9f55-561e5eb2dbc4/tamil_romantic_novels_free_download_scribd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e38ddb75-f52a-421c-a074-4128e87c2a06/vamajuv.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_off0000eb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 5456 bytes
SHA-256: fe98bf022541c440476bc3ae506767849212760eb075d2578b9efb63ce3b4188
font_01_sfnt_off0000fdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC7 12544 bytes
SHA-256: 9170b6c8ae1f3339908ef9d29033b967da4adb2fbc103df851c6335b6608c022