Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fca230386b50335…

MALICIOUS

PDF

76.4 KB Created: 2021-03-03 12:29:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3be6f87d19f2897c079cafbf44660196 SHA-1: 5b3f5a0c721ba7cda8cf5e861b2030c3927d88be SHA-256: 3fca230386b503356345cdb10b17542a8fc57f17ae7a44d2e6be7024b7ff88a7
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 0.9998

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://ponafet.ru/wix?keyword=dee+shaw+instagram PDF link annotation
    • https://kelebewo.weebly.com/uploads/1/3/4/3/134359650/aa227dc476.pdfIn PDF document text
    • http://erkutungotu.com/periodic_table_of_elements_worksheet4sx31.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/bowisotizuvijofab.pdfIn PDF document text
    • https://lixobanifalito.weebly.com/uploads/1/3/4/4/134443724/vutubitupo_dodeniga_sofakefupapujow.pdfIn PDF document text
    • https://cdn.sqhk.co/volumusigu/ZYWjg8y/rosokiromozavomejodukitun.pdfIn PDF document text
    • https://bokasaveti.weebly.com/uploads/1/3/4/7/134725866/4fa190e6.pdfIn PDF document text
    • https://jizotigop.weebly.com/uploads/1/3/0/8/130874082/zolibegew.pdfIn PDF document text
    • https://wovofonunubani.weebly.com/uploads/1/3/1/4/131408017/vanojewukekobi-mipegegiw-mudozizela-nudono.pdfIn PDF document text
    • http://jobauthor.online/plc_programming_software_siemens1ecvh.pdfIn PDF document text
    • https://wobelafesuta.weebly.com/uploads/1/3/4/7/134767333/zafivawijiwesa.pdfIn PDF document text
    • https://xoxajunun.weebly.com/uploads/1/3/4/3/134351876/840921497797cc.pdfIn PDF document text
    • http://sait-ok.ru/gupilonuxejizezodan6rrg.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/xorume.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/juleximefebedorufubidapil.pdfIn PDF document text
    • http://raifaisentgo.online/bolowemenojipemanasubofrsu2e.pdfIn PDF document text
    • https://zediruli.weebly.com/uploads/1/3/4/7/134725524/jowonezorovusogiloro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pekafujojef.onlinewebshop.net/xirabosuvoviwaguwuwe.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_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 5156 bytes
SHA-256: 12749d8ac03de95c4d4666e92d202b8178da61b37ea9bb3fe5281a319cefe843
font_01_sfnt_off0001012e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012E 10464 bytes
SHA-256: ff5b407f242c3ee85d19c45048e85d9cf45ed75beaa98c360a1c414875ec682b

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