Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8476ed1520b025…

MALICIOUS

PDF

70.5 KB Created: 2021-06-06 09:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a6d693de8c7b51159d635b100c1255e5 SHA-1: cd67ca4b76ab7c7fae0ca8be9afafec69209478b SHA-256: 2d8476ed1520b0259cd8638213cdf96f52131c032bfb49a6962d7c5c0e029703
194 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. It uses an invoice-themed lure. 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 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://huntic.ru/pbw?utm_term=how+to+write+a+contract+termination+letter+to+employer PDF link annotation
    • https://nabatiniwoz.weebly.com/uploads/1/3/4/8/134889778/957df7.pdfIn PDF document text
    • https://towodoruzaxigol.weebly.com/uploads/1/3/6/0/136050186/biritovumipugewi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392651/normal_604cef992e4b6.pdfIn PDF document text
    • https://jofetafoba.weebly.com/uploads/1/3/4/4/134485710/36baa86a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491432/normal_606b537776426.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406464/normal_5fec088370943.pdfIn PDF document text
    • https://gakubuzavesow.weebly.com/uploads/1/3/0/8/130813888/7ad81.pdfIn PDF document text
    • https://rixijufufapug.weebly.com/uploads/1/3/4/4/134497528/mijib.pdfIn PDF document text
    • https://nugukofijopi.weebly.com/uploads/1/3/2/7/132712180/rixafo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450260/normal_5ffd681ee03ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418565/normal_60479f7338e3e.pdfIn PDF document text
    • https://dixapixukezawe.weebly.com/uploads/1/3/5/3/135388261/nofexo_fonetuwitogupan_metaladuz_pitoxativedo.pdfIn PDF document text
    • https://karewugudamebag.weebly.com/uploads/1/3/3/9/133986918/kadipifixixo_pikimisi_temurikuli.pdfIn PDF document text
    • https://jekotufuwin.weebly.com/uploads/1/3/1/4/131406020/217aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481839/normal_60b90b66191cc.pdfIn PDF document text
    • https://tolaguse.weebly.com/uploads/1/3/0/8/130814280/devixipagavip-dakuv-wasef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://werinenimuta.pbworks.com/w/file/fetch/144707130/fonction_exponentielle_terminale_s_exercices_corrigs.pdfIn PDF document text
    • http://poguvovuk.pbworks.com/f/plotagon_story_mod_apk_unlocked_download.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/w/file/fetch/144498990/xosojufiwexuvuda.pdfIn PDF document text
    • http://faxamom.pbworks.com/w/file/fetch/144602064/36301424657.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_off0000d8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CD 5056 bytes
SHA-256: d678efd871e98be3fceb35e72160d962bf872fc6c7577134d9594ddf7989346c
font_01_sfnt_off0000e9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 10148 bytes
SHA-256: 680a3b6c2813e815e94aff2d2ad1d51c8f6fab2badedc3abb8ef04bbccc2f928